International Maths Olympiad Forum By SOF Olympiad Trainer - Page 414
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ishaan samantra from FBS , Bhubaneswar
Subject :IMO    Class : Class 3

Ans 1:

Lokesh Krishnan from Pon Vidyashram School, CHENNAI
Class : Class 7
A

Ans 2:

Lokesh Krishnan from Pon Vidyashram School, CHENNAI
Class : Class 7
A

Ans 3:

Lokesh Krishnan from Pon Vidyashram School, CHENNAI
Class : Class 7
A

Ans 4:

Mannat Singh from Ryewood international school, LONAVALA
Class : Class 3
C

Ans 5:

Mannat Singh from Ryewood international school, LONAVALA
Class : Class 3
C

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Aryaveer Agrawal from DELHI PUBLIC SCHOOL, Ahmedabad
Subject :IMO    Class : Class 8

Ans 1:

Taes Padhihary from Disha Delphi Public School, Kota
Class : Class 9
A

Ans 2:

manish from cms, lucknow
Class : Class 9
think that you are buying toffees if you buy 2 toffees of $2 each then your total cost would be 2*$2 =$4 similarly here, (x+4)*(x+4) =x^2 + 8x + 16 hence option a

Ans 3:

Taes Padhihary from Disha Delphi Public School, Kota
Class : Class 9

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Aryaveer Agrawal from DELHI PUBLIC SCHOOL, Ahmedabad
Subject :IMO    Class : Class 8

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Aryaveer Agrawal from DELHI PUBLIC SCHOOL, Ahmedabad
Subject :IMO    Class : Class 8

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Devansh from asn senior secondary school, delhi
Subject :IMO    Class : Class 3

Ans 1:

Ivan Tyagi from Chirec, Hyderabad
Class : Class 5

Ans 2:

Ivan Tyagi from Chirec, Hyderabad
Class : Class 5
m

Ans 3:

Soham Das from St. Joseph's School, Jiaganj
Class : Class 5
p

Ans 4:

Soham Das from St. Joseph's School, Jiaganj
Class : Class 5

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ishit from EUROSCHOOL THANE, THANE WEST
Subject :IMO    Class : Class 4

Ans 1:

Angshu from Dehli Public School Bangalore East, Bangalore
Class : Class 7

Ans 2:

Sashrika Pasunoori from KV Gachibowli, Hyderabad
Class : Class 3
Answer is A.

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radhika gopal from tips, Coimbatore
Subject :IMO    Class : Class 5

Ans 1:

Pradnya Ambatipudi from Vikas- The concept school, Hyderabad
Class : Class 7
the answer is 4{d}

Ans 2:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 8

Ans 3:

Hriday Sriram from APL Global School, Chennai
Class : Class 5
Why is the solution answer D but, answer C? Answer 4 is answer D!!!

Ans 4:

Aditya Saha from The Lexicon International School Kalyaninagar Pune, Pune
Class : Class 8
the answer is 4{d}

Ans 5:

Arav Aanand from Father Agnel School, Noida
Class : Class 6

Ans 6:

adwitiya saxena from Ryan Internatinational School, Navi Mumbai
Class : Class 6
I think that it's a printing mistake. IN solution they are writing C,H,A,I have a line of symmetry which are 4 letters, but in the answer they are giving 3

Ans 7:

Mannat Verma from Vivek High School , Chandigarh
Class : Class 6
Srijit, you are absolutely right!

Ans 8: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

Ans 9:

SRIJIT CHATTOPADHYAY from THE SHISHUKUNJ INTERNATIONAL SCHOOL, Indore
Class : Class 8
Their ( SOF Olympiad Trainer) solution is saying four , still they have marked 3 .

Ans 10:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai
Class : Class 6
the answer should be D,4 and not C,3 as the letters in CHAIR are C,H,A,I but not R have a line of symmetry.

Ans 11:

Vikram from AVM, Mumbai
Class : Class 5
my answer is 4 but you marked it wrong

Ans 12:

Abhijato Chatterjee from Bharatiya Vidya Bhavan, Kolkata, kOLKATA
Class : Class 6
in the solution they say 4 and it is 4 but they mark it as wrong

Ans 13:

Prateeshtha Ghosh from Samhita Academy, Bangalore
Class : Class 8
my answer is 4 but you marked it wrong

Ans 14:

manmeet from bbps pusa road, New Delhi
Class : Class 6

Ans 15:

Arav Aanand from Father Agnel School, Noida
Class : Class 6
The answer should be D. 4 as C, H, A, and I have at least a line of symmetry

Ans 16:

Kavitharini Joseph from HUS, Chennai
Class : Class 6
my answer is 4 but you marked it wrong

Ans 17:

Joe Bipin from National Public School Agra, Bangalore
Class : Class 8
it is a printing mistake

Ans 18:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 8
my answer is 4 but you marked it wrong

Ans 19:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA
Class : Class 7
my answer i 4 but they marked it wrong and showed the correct answer 3 but in the solution they are saying the answer is 4.

Ans 20:

Shuvangi Das from Vivekananda mission school, haldia
Class : Class 8
why they are giving the answer as 4

Ans 21:

Kanjani Ghonge from Ira Global School, Dombivli
Class : Class 8
my answer is 4 but it is marked as 3

Ans 22:

Tintin from , Kolkata
Class : Class 7
the correct ans should be option D

Ans 23:

DEBOSMITA GARAI from G.D.BIRLA CENTRE FOR EDUCATION, kolkata
Class : Class 6
your answer is wrong

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manish from cms, lucknow
Subject :IMO    Class : Class 8

Ans 1:

trainee from Gandhi city public school, pulgaon
Class : Class 8
the answer is(b) 65

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Aditi from Salt Lake School, Kolkata
Subject :IMO    Class : Class 9

The following table gives the ages of teachers in XYZ school.₹

A teacher is selected at random from the group, then which of the following statements is INCORRECT?

A Probability of a teacher having age greater than or equal to 35, is
B Probability of ateacher having age more than or equal to 25 and less than 40, is
C Probability of a teacher selected is of age not less than 30, is
D Probability of a teacher selected from the youngest group, is


In the age group 35-40, it should be 300 instead of 320 .Only then is the answer coming ..according to the solution it is 300.

Ans 1:

Ankit Kumar from Rkm, Chapra
Class : Class 9

Ans 2:

ARYAN PRASAD from Podar Internation School, Vadodara
Class : Class 9
option c

Ans 3:

ARYAN PRASAD from Podar Internation School, Vadodara
Class : Class 9

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Akriti ANannd from DPS Gaya, GAYA
Subject :IMO    Class : Class 7

Which of the following statements is CORRECT?
Statement-1 :Mathematics textbook for Class VII has 320 pages. The chapter ‘Symmetry’ runs from page 261 to page 272. The ratio of the number of pages of this chapter to the total number of pages of the book is 3 : 81
Statement-2 :In a school of 100 students, only 2 out of 5 students can participate in a quiz. The percentage of students that participate in the quiz is 40%.

A Only Statement-1
B Only Statement-2
C Both Statement-1 and Statement-2
D Neither Statement-1 nor Statement-2


Ans 1:

Harsh Kumar from Maharishi Vidya Mandir, Guwahati
Class : Class 8
I have confusion in statement 1 but 2nd statement are correct. 1st statement in first no of pages in symmetry chapter is 12. total no pages is 320. the ratio is 12:320 =3:81 = 1 :27 2nd statement 2 out of 5 can participate means 40% of the student the 40% of 100 is 40 the percentage of students that participate in the quiz = 40/100*100 40%

Ans 2:

from Podar International School,Dhule, Dhule
Class : Class 8
12:320=3:80 in its simplest form. It is not equal to 3:81. You may simplify it like 12/320 divide both numerator and denominator by 4. You will surely get the answer as 3:80.

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