International Maths Olympiad Forum By SOF Olympiad Trainer - Page 438
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Mantavya Dixit from DAV Shreshtha Vihar, Delhi
Subject :IMO    Class : Class 6

Ans 1:

Pranjal from St aloysius, Bhusawal
Class : Class 6

Ans 2:

Kashish Kathuria from Delhi Public School, Bangalore
Class : Class 9

Ans 3:

Arjun Gourineni from CHIREC International School, Hyderabad
Class : Class 7
FRIDAY

Ans 4:

Kashish Kathuria from Delhi Public School, Bangalore
Class : Class 9

Ans 5:

Ojaswi from SAINT JOHNS CONVENT SCHOOL LANSDOWNE, DELHI
Class : Class 9
The answer is Thursday.If you count 1 week (7 days) from Friday (Including Friday) you will get Thursday.So after 301 days it will Thursday.

Ans 6:

Prayush goyal from Sun Valley international school, ghaziabad
Class : Class 7

Ans 7:

chetan malviya from atul vidyalaya, valsad
Class : Class 8
301 days is divisible by 7 so there will be no addition or subtraction on friday. if it was not divisible by 7 then it might be someday else

Ans 8:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
301st day will be friday

Ans 9:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 9
Yeah @chetan malviya , but we also need to check @VAISHNAVI 's answer which is also correct

Ans 10:

Ananya Tiwari from Sapphire International School, Ghaziabad
Class : Class 7
its friday

Ans 11:

HIMANISH BASU from APS BANGALORE , Bangalore
Class : Class 7

Ans 12:

Kashish Kathuria from Delhi Public School, Bangalore
Class : Class 9
The solution is not clear. Please give accurate and understandable solutions .

Ans 13:

HIMANISH BASU from APS BANGALORE , Bangalore
Class : Class 7
It is fly day.

Ans 14:

Daksh from Greenwood High, Bengaluru
Class : Class 7
It is Friday

Ans 15:

Parth somani from Daffodils world school, Sikar Rajasthan
Class : Class 7
ANSWER IS FRIDAY ONLY

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Devananda from Queen of angels bharuch, bharuch
Subject :IMO    Class : Class 5
Fr

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Pranav Preetham from APL Global School, Chennai
Subject :IMO    Class : Class 4

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UTKARSH SAWARN from AIR FORCE SCHAOOL AMBALA CANTT, AMBALA CANTT
Subject :IMO    Class : Class 9

Ans 1:

Abhiram C A from Jindal Vidya Mandir, bellary
Class : Class 9
D

Ans 2:

Kashish from Mgps, Jaipur
Class : Class 9
B

Ans 3:

Kashish from Mgps, Jaipur
Class : Class 9
B

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Aniket Gupta from National Public School, Bangalore
Subject :IMO    Class : Class 8

Given below are the steps of construction of a quadrilateral WXYZ, where WX = 7.5 cm, XY = 9 cm,
∠W = 80° , ∠X = 115° and ∠Y = 110° .
Which of the following is a wrong step?
(i) Draw WX = 7.5 cm.
(ii) Draw ∠AWX = 80° at W and ∠BXW = 115° at X.
(iii) With X as a centre and radius 9 cm, draw an arc to intersect XY at Y.
(iv) Draw ∠XYZ = 110° such that ZY meets WA at Z.

A(iii) and (iv) only
B(iii) only
C(ii) and (iv) only
D(ii) only


Please explain how statement iv is wrong

Ans 1:

Mudit garg from La blossoms school, Jalandhar
Class : Class 7

Ans 2:

Arnav from Head Start Educational Academy, Bengaluru
Class : Class 5
no step is wrong.

Ans 3:

Rudransh Kashyap from DPS RK Puram, Ghaziabad
Class : Class 8
b

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Ankit kumar Jha from Ryan International School , Ghaziabad
Subject :IMO    Class : Class 7

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Arnav kaul from Chirec, Hyderabad
Subject :IMO    Class : Class 5

Ans 1:

Arnav from Somerville noida, noida
Class : Class 10
correct answer is b

Ans 2:

PANAV TANEJA from Ivy world school, Jalandhar
Class : Class 5
Correct answer is option B

Ans 3:

Vallabh Agrawalla from Sai International School, Bhubaneswar
Class : Class 8
The answer should be A. Out of the 4 figures only the square has 2 lines of symmetry. The other figures like the parallelogram and the F have 0 lines of symmetry. The isosceles triangle has one line of symmetry. And the parallelogram has 0 lines on symmetry. On the vertical axis, when we divide it into 2 parts. 1 part is higher at the upper side and the second one is higher at the lower side. The same happens with the horizontal axis.

Ans 4:

Nirav from TFS, Bangalore
Class : Class 5
answer should be b)

Ans 5:

Vihaan from K R Mangalam World School Vaishali, Ghaziabad
Class : Class 9
Yeah, it should be A.

Ans 6:

Arnav from Somerville noida, noida
Class : Class 10
please check it,its b

Ans 7:

Dhawala from SBPPS, Pune
Class : Class 5
correct answer is B.

Ans 8:

YUVRAJ MATTA from DPS EAST OF KAILASH , NEW DELHI
Class : Class 5
our answer is correct but your answer is wrong . The answer should be B

Ans 9:

Aradhya Gautam from PIS, Thane
Class : Class 5

Ans 10:

TRISHA SINGH from St. Joseph Shaktinagar, SONEBHADRA
Class : Class 7
SOF IS RIGHT THIS TIME GUYS.SO STOP ARGUING ON THIS QUESTION.

Ans 11:

akashdeep from Presidium School , New Delhi
Class : Class 7
b as 1st and 2nd have 2 lines of symmetry or more

Ans 12:

sheel gupta from DPS, vasant kunj, delhi
Class : Class 9
the correct answer of this question is B

Ans 13:

vdvd from Suncity School, Gurgaon
Class : Class 5
CORRECT ANSWER IS B.CORRECT ANSWER IS B

Ans 14:

Adi Parandkar from Blue Ridge Public School, pune
Class : Class 5
Correct answer is B

Ans 15:

RAKSHIKA JHA from St.XAVIER , ARARIA
Class : Class 5
Only square is a figure in this figures that has only two lines of symmetry

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Devananda from Queen of angels bharuch, bharuch
Subject :IMO    Class : Class 5

Ans 1:

Prateeshtha Ghosh from Samhita Academy, Bangalore
Class : Class 8

Ans 2:

ARJUN SHARMA from sunvalley international school, Delhi
Class : Class 8
HOW TO DO THIS ?????????

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yagna from DPS, Surat
Subject :IMO    Class : Class 8

Ans 1:

Prachi from Holy Child Public school, Faridabad
Class : Class 9
Solution itself shows 62but it is making it wrong

Ans 2:

Ashwin Shridhar from Vidyashilp Academy, Bangalore
Class : Class 9
62

Ans 3:

Lakshya Sahu from St Joseph English Medium Senior Secondary School, Mahoba
Class : Class 8
62

Ans 4:

Vaastav Mishra from BMPS Taxsila, Bhubaneswar
Class : Class 9
62 is correct

Ans 5:

Archisman Biswas from Santipur Municipal High School, Nadia
Class : Class 8
This is not fair. Solution is correct but the answer is wrong. It is 62.

Ans 6:

from D.P.S delhi public school kuwait, Vishakhapattanam
Class : Class 8
Sof has many more mistakes like this

Ans 7:

Nikhil Date from Lilavatibai Podar High School, Mumbai
Class : Class 8
Yes, it is 62

Ans 8:

Hrishikesh Mavily from DPS, Bangalore
Class : Class 8
It is 62 not 52

Ans 9:

Yashi from Chrysalis High, Bangalore
Class : Class 8
62 is the answer. 52 x 52 = 2704

Ans 10:

Arkajyoti Das from techno, Cooch Behar
Class : Class 8
wrong answer

Ans 11:

Anirudh from 989820Delhi Pubic school Rohini , Delhi
Class : Class 8
62

Ans 12:

Tanmay singh from DPS Visakhapatnam , Visakhapatnam
Class : Class 8

Ans 13:

Angshu from Dehli Public School Bangalore East, Bangalore
Class : Class 8
This is not good. SOF has too many mistakes like this. Though the solution says 62, the answer is registered as 52. Please fix this.

Ans 14:

Ditya Goel from Presidium, Gurgaon
Class : Class 8
Answer is 62

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Satyaki Bandopadhyay from Don Bosco ParkCircus, Kolkata
Subject :IMO    Class : Class 3

In the given figure, a large rectangle is 60 metres long and 20 metres wide. 2 small rectangles are 30 metres long and 20 metres wide each. Which of the following statements is CORRECT?


A The total length of the large rectangle is twice the total length of the small rectangle.
B The total length of the large rectangle is equal to the total length of the small rectangle.
C The total length of the large rectangle is 30 meters more than the total length of the small rectangle.
D The total length of the large rectangle is equal to 160 meters and the total length of the small rectangle is equal to 100 meters.


option A and C are both correct. If D is the correct option then instead of length you should make it more specific to say length of the boundary. A rectangle by definition has 2 sides length and breadth

Ans 1:

IAMLOST from ABC, Pune
Class : Class 8
A and C are correct.Please write unambiguous lines. Write boundary or perimeter to be precise.as children view rectangle in length and breadth only.

Ans 2:

Rishaank Goel from Lotus valley , Noida
Class : Class 3

Ans 3:

Akshara Dalan from DR D Y PATIL INTERNATIONAL SCHOOL NERUL, NAVI MUMBAI
Class : Class 3
The word should be PERIMETER as the word TOTAL LENGTH [mentioned] can mean the sum of the 2 sides of the rectangle and can not be understood very well.So, according to me the answer can be both A as well as C.

Ans 4:

Rijrashwa Sreejith from Devamatha C M I Public School, Thrissur
Class : Class 10
Please use proper words. It is perimeter. Not total length. Total length is the sum of the two longer sides.

Ans 5:

Yash from Dps, Noida
Class : Class 2
sorry I was wrong the ans is d only because total length is here equal to perimeter for this condition

Ans 6:

Samaira Ahuja from Gyanshree, Noida
Class : Class 3
160 is the perimeter of the big rectangle and not the length

Ans 7:

Pragnay Priyadarshi from Quantum Leap School, HYDERABAD
Class : Class 7
Please use the correct wordings, Perimeter. It’s just confusing to deal with word length.

Ans 8:

RAGHAV VARSHNEY from CITY MONTESSORI SCHOOL GOMTINAGAR LUCKNOW, Lucknow
Class : Class 6
A and C both are correct. it should be perimeter or boundary.

Ans 9:

Eshan Ghosh from Don Dosco, Berhampore
Class : Class 3
Both A and C are correct

Ans 10:

Varenyam Wadhwa from Hansraj Model School, Punjabi Bagh, New Delhi
Class : Class 3

Ans 11:

Iraj Singh from DPS Megacity, Kolkata
Class : Class 7
The correct answer is D because the total length of the large rectangle is 160 meters and the total length of the small rectangle is 100 meters

Ans 12:

inaira heredia from Jamnabai narsee international school, MUMBAI
Class : Class 4
A and C are Correct

Ans 13:

Yash from Dps, Noida
Class : Class 2
both A and C are correct

Ans 14:

Agriye Kamboj from ST.XAVIER SEC SE CO ed Bhopal, BHOPAL
Class : Class 8
Answer is d.

Ans 15:

inaira heredia from Jamnabai narsee international school, MUMBAI
Class : Class 4
Yes both A and C are Correct

Ans 16:

Vaishnavi singh from All saint international school , Alwar
Class : Class 5
A

Ans 17:

Rishaank Goel from Lotus valley , Noida
Class : Class 3
160 is the perimeter not the length

Ans 18:

ANSHUL TANWAR from ST TERESA CONVENT SCHOOL GHAZIABAD, NOIDA
Class : Class 3
lenght should be replaced by parameter. ques.wording is wrong

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