International Maths Olympiad Forum By SOF Olympiad Trainer - Page 598
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harnoor from cambridge international school, nawanshahr
Subject :IMO    Class : Class 8

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Megha Hegde from PSBBLLA, Bengaluru
Subject :IMO    Class : Class 7

Ans 1:

Sriyansh from Surabhi , Hosapete
Class : Class 9
It's simple addition and subtraction. The total cost of both toys is 52.45+25.32=77.77 You gave him a hundred rupee note. So you gave him 22.23 rupees morethe actual prize which you would recieve as change. So the answer is 22.23 (100-77.77=22.23)

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EKLAVYA GONDULE from DPS BHILAI, Bhilai
Subject :IMO    Class : Class 5

Ans 1:

Anirudh Bagri from AMNS, Mumbai
Class : Class 5
question itself is wrong

Ans 2:

Rushil Arora from DPS, New Delhi
Class : Class 5
the answer should be C

Ans 3:

ARADHYA AGARWAL from NEW ERA PROGRESSIVE SCHOOL, Korba
Class : Class 8
Answer is C

Ans 4:

Mystic Girl from NPS, Bnagalore
Class : Class 6
How is the answer B?

Ans 5:

Aditya Sai Kedarisetty from Sri Kumarans childrens Academy DKS, Bangalore
Class : Class 7
This question is itself wrong..

Ans 6:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA
Class : Class 7

Ans 7:

Pulin Sharma from Marble Arch School, Mumbai
Class : Class 6
The answer is C] GH Because if we count the blocks in AB then, it's4 If we count the blocks in GH then, it's4 THIS S MY FORMULAE

Ans 8:

Yajat Manoj from Vibgyor, Bengaluru
Class : Class 5
right

Ans 9:

Pratham Dave from GNS, Bangalore
Class : Class 7
Master answer required

Ans 10:

navya from Gyanshree, Noida
Class : Class 6
OMG, the question itself is wrong

Ans 11:

Sai Lakshmi Rao from Maneckji Cooper Education Trust, Mumbai
Class : Class 4
Wrong options SOF.!!!!!! Do you want us to fail

Ans 12:

Jeronee from Christwood School, PERUMBAKKAM
Class : Class 5

Ans 13:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
ans 7 is right. perpendicular = 90 degree intersecting straight lines

Ans 14:

Amogha from Hindustan international school, Guindy, Chennai
Class : Class 8
B is the correct answer guys, look at the blocks carefully.

Ans 15:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 8
Ans is C..... Olympiad Trainer please give master answer or solution.

Ans 16:

Swarnava Pal from Vivekananda Mission School, Haldia
Class : Class 8
It's cofusing

Ans 17:

Prajwal Thakur from South Point High School, Kolkata
Class : Class 9
The answer should be C

Ans 18:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA
Class : Class 7
it should be C

Ans 19:

Sof Team from Sof Olympiad Trainer Helpdesk, Bangalore
Class : Class 8
do not worry sof will make the same mistake on paper

Ans 20:

prarabdh thakur from podar international school, nashik
Class : Class 4
ans is c

Ans 21:

Kanjani Ghonge from Ira Global School, Dombivli
Class : Class 8

Ans 22:

Sunita from Dps, Greater Noida
Class : Class 9

Ans 23:

Shreejal moharana from DPS Greater Faridabad, Faridabad
Class : Class 8
b is totally correct just see the blocks carefully

Ans 24:

Niharikaa Pande from BILLABONG HIGH INTERNATIONAL SCHOOL MALAD, Mumbai
Class : Class 6
It is B since GH is not perpendicular by the smallest of angles. EF is perpendicular since if you look at the triangles or 5-sided shapes that are made when lines AB and EF come through a square with an angle not equal to 45 degrees, the sizes are the same. This shows that AB and EF are a pair of perpendicular lines.

Ans 25:

Rayansh Mishra from VIBGYOR HIGH MAGARPATTA, Pune
Class : Class 8
All transversal lines look perpendicular

Ans 26:

Suhani Agarwal from St. Mary's ICSE School, Mumbai
Class : Class 8

Ans 27:

Sinjini Chakraborti from Indus Valley World School , Kolkata
Class : Class 7

Ans 28:

Saanvi Jain from Lotus Valley International School, Noida
Class : Class 5
the answer is d as the line needs to be a proper slant and only i-j is properly slanted

Ans 29:

Niharikaa Pande from BILLABONG HIGH INTERNATIONAL SCHOOL MALAD, Mumbai
Class : Class 6

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NACHIKET KRISHNAN from THE MODERN SCHOOL, FARIDABAD
Subject :IMO    Class : Class 4

Ans 1:

DHRUV.KHOSLA.4.lvisn from Lotus Valley International School Noida, Noida
Class : Class 4
d

Ans 2:

from DAV, Chennai
Class : Class 8
d

Ans 3:

Dheer Pandey from Sentia The Global School, Hyderabad
Class : Class 10
no , its b.

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Adwait Shiva from Udgam School For Children, Ahemdabad
Subject :IMO    Class : Class 5

Ans 1:

Shreyas Singh from Podar International School, Pune
Class : Class 6

Ans 2:

Amlan choudhury from GD Birla center for education , Kolkata
Class : Class 7

Ans 3:

Harsh Sobti from the samhita academy, BLR
Class : Class 5

Ans 4:

Siddarth Rastogi from Greenwood High Int'l School, Bangalore
Class : Class 5
A perpendicular line is 90 degrees, last one doesn't count as 90 degrees, so C

Ans 5:

Ashwak from Cambridge, Jalandhar
Class : Class 8
But what about the curved arrow

Ans 6:

Rayna Agarwal from St. Xaviers High School, Gurgaon
Class : Class 5
The answer should be C because in the first figure there are prependicular lines in the bottom in figure 2 there are prependicular lines all four sides near the arrows and in figure 3 there are prependicular lines at the bottom while there are no prependicular lines in figure 4 as they are all acute and obtuse angles so, the answer should be C not D.

Ans 7:

Anika Saha from New Town School, KOLKATA
Class : Class 6
how

Ans 8:

Riddhiraj Saha from St. Xeviers Institution , Panihati, Kolkata
Class : Class 8
All 4 figure has perpendicular line along perimeter

Ans 9:

Arav Jain from Global edge school, Hyderabad
Class : Class 5
How

Ans 10:

prarabdh thakur from podar international school, nashik
Class : Class 4

Ans 11:

Aaditya Malhotra from Isaac Newton Global School, Mumbai
Class : Class 3
C

Ans 12:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8

Ans 13:

Riddhiraj Saha from St. Xeviers Institution , Panihati, Kolkata
Class : Class 8

Ans 14:

NAMAN SINGH from SETH ANANDRAM JAIPURIA SCHOOL, Ghaziabad
Class : Class 8
i also got it wrong

Ans 15:

Shamvabi Samanta from Gitanjali Primary School,ICSE, Hyderabad
Class : Class 9
It should be C as it is written that we have to find the perpendicular line for each figure, so there are three figures with perpendicular line but if we consider how many perpendicular lines are there in this picture then it should be 4. This answer is absolutely wrong.

Ans 16:

Uzair Khan from Narayan Olympiad School, Chennai
Class : Class 5

Ans 17:

Anirudh Bagri from AMNS, Mumbai
Class : Class 5
'c' = correct

Ans 18:

Rohan TR from Sri Aurobindo memorial school, Bangalore
Class : Class 6
It is c

Ans 19:

Ashwak from Cambridge, Jalandhar
Class : Class 8
All figures have perpendicular lines

Ans 20:

Rimi from TLISK, pune
Class : Class 9
D cannot be the answer at all.

Ans 21:

TRISHA SINGH from St. Joseph Shaktinagar, SONEBHADRA
Class : Class 7
CONFUSING QUESTION

Ans 22:

Harsh Sobti from the samhita academy, BLR
Class : Class 5
it should be a. thats what my supery dupery expert dad said

Ans 23:

Clianta Nagi Reddy from Pinnacle High InternationL School, Mumbai
Class : Class 4

Ans 24:

Riddhiraj Saha from St. Xeviers Institution , Panihati, Kolkata
Class : Class 8

Ans 25:

Ayushi Chatterjee from DPS Noida, Noida
Class : Class 5
Angles consideration is confusing ....sometime inner and sometime outer angle is consider ....actually SINGLE LINE FIGURE SHOULD BE GIVEN

Ans 26:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram
Class : Class 7
Something is wrong here. We have to confirm about it.

Ans 27:

Pratham Dave from GNS, Bangalore
Class : Class 7
D is the answer to this question because all the lines are perpendicular and in the 3rd one the bottom lines are perpendicular

Ans 28:

somesh from Centre point katol road, Nagpur
Class : Class 6
it is d

Ans 29:

Ridit Mishra from Delhi Public School, Gurgaon
Class : Class 8

Ans 30:

prarabdh thakur from podar international school, nashik
Class : Class 4
yes

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Faraz Khan from Rassaz International, Mumbai
Subject :IMO    Class : Class 6

Ans 1:

Shourya Kumar from Delhi Public School Noida, Noida
Class : Class 9
it should be 0.166674175

Ans 2:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
none of the options is correct

Ans 3:

Kyra from Accadis international school, Germany
Class : Class 6

Ans 4:

Jaiansh Dabas from St Xaviers High School, Gurgaon
Class : Class 7
I tried it a 1000 times with calculator it is giving 0.0000515686

Ans 5:

Shreyas K from Kennedy High The Global School, Hyderabad
Class : Class 9
correct answer is 0.0000515686. So, none of the provided options are correct.

Ans 6:

Rannvijay Singh from Palms Middle School, LA, Los Angeles
Class : Class 7

Ans 7:

Faraz Khan from Rassaz International, Mumbai
Class : Class 6
none of the options are correct

Ans 8:

Kumar Krishiv from Apeejay School, Noida
Class : Class 8
None of these are correct I have done in calculator

Ans 9:

Vihaan Binaykia from Riverside, AHMEDABAD
Class : Class 5
Answer given is correct:0.0001289 - (0.0000000274 x 1293) 0.0000419032=(0.0001289 - 0.0000354282) 0.0000419032=0.0000934718 0.0000419032=0.00011353750

Ans 10:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
Ya Parth Kaushish you are right. Got it Vihaan :) Thanks

Ans 11:

DIPANWITA MAITI from SPINGDALES SCHOOL PUSA ROAD, New Delhi
Class : Class 9

Ans 12:

Agastya Soni from DPS Whitefield, Bengaluru
Class : Class 6
It should be 0.1666731750

Ans 13:

Rannvijay Singh from Palms Middle School, LA, Los Angeles
Class : Class 7
none of the options are correct and the solution makes no sense the correct answer is 0.0000515686sof is glitched

Ans 14:

Ashwak from Cambridge, Jalandhar
Class : Class 8
None of the given options is correct .

Ans 15:

Parth Kaushish from MDPS, Faridabad
Class : Class 6
the correct answer is going to be 0.0000515686 . I have tried it 10 times. Its given wrong pls correct it SOF

Ans 16:

Carrie Goyal from OPBMS, Mandi Gobindgarh
Class : Class 7
according to bodmas d option is correct

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Aditya Singh from Vibgyor Haralur Bangalore, Bangalore
Subject :IMO    Class : Class 3

Ans 1:

ANUSKA from DPS, NOIDA
Class : Class 3
TENS

Ans 2:

Avighna Shastri from doha modern indian school, doha
Class : Class 2
tens

Ans 3:

ANUSKA from DPS, NOIDA
Class : Class 3
TENS

Ans 4:

Aditi Shiv Shankar Jaiswal from Delhi Public School Jeddah, Jeddah
Class : Class 4

Ans 5:

Aditi Shiv Shankar Jaiswal from Delhi Public School Jeddah, Jeddah
Class : Class 4
C

Ans 6:

Kashika Goel from DPS Noida, Noida
Class : Class 6

Ans 7:

from AHPS,
Class : Class 3

Ans 8:

Aarna Agarwal from Manav Rachna International School, Gurgaon
Class : Class 5

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Aditya Singh from Vibgyor Haralur Bangalore, Bangalore
Subject :IMO    Class : Class 3

Mrs Sharma wrote a 2-digit number on the blackboard. Three students Lalit, Vinay and Prashant said the following statements about that number.
Lalit : "It is a 2-digit number but not the least".
Vinay : "It is the predecessor of least 3-digit number".
Prashant : "It is having three different digits".
If only two of the three students said the truth, who is definitely lying?

A Lalit
B Vinay
C Prashant
D Both (A) and (B)


Ans 1:

Aditi Shiv Shankar Jaiswal from Delhi Public School Jeddah, Jeddah
Class : Class 4
Prashant

Ans 2:

Saanvi from DPS INTERNATIONAL SCHOOL, Singapore
Class : Class 4

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D 183 from Lotus Valley International School, Noida
Subject :IMO    Class : Class 4

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Gireesha from innocent hearts school jalandhar, Jalandhar
Subject :IMO    Class : Class 9

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

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