International Maths Olympiad Forum By SOF Olympiad Trainer - Page 498
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nitin bhutada from bhavans b p vidya mandir trimurti nagar nagpur, Nagpur
Subject :IMO    Class : Class 7

Ans 1:

Diptanil Sadhukhan from T.T.Dr.B.C.Roy Vidyalaya, Kolkata
Class : Class 7
Really it will be 20

Ans 2:

Bhagyesh Kamal from DPS, Mumbai
Class : Class 8

Ans 3:

Arnav Kharche from Vibgyor High Jakkur, Bangalore
Class : Class 7
It should be 20

Ans 4:

ARNAV VIVEK PATIL from Podar International School Chalisgaon, Chalisgaon
Class : Class 7

Ans 5:

Ramya from brindavan vidyalaya, Trichy
Class : Class 9
ANSWER MUST BE 20 SINCE FORMULA IS N-3 SO FOR ONE VERTICE IT IS 10 SO TWO WILL BE 20

Ans 6:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
The answer should be 20

Ans 7:

AKSHIT CHHABRA from APEEJAY SCHOOL NOIDA, NOIDA
Class : Class 8
answer should be 20

Ans 8:

Hardik Khilnani from DPS Bangalore North, Bangalore
Class : Class 7
Number of diagonals drawn from polygon of n sides is n-3Thus, answer should be 2(13-3) = 2*10 = 20

Ans 9:

Rohan A Gowda from Jnana Sagara International Public School, Channarayapatna
Class : Class 7
Answer is 20

Ans 10:

Aniket Patankar from Symbiosis International School, Pune
Class : Class 8
it should be 20 because the formula for number of diagonals from a vertices is n-3, so for one vertice is 10 diagonals so two is gonna be 20

Ans 11:

Sarang Shete from Amanora School, Pune
Class : Class 8
ans is 20!!

Ans 12:

SATYAPRAKASH KAR from LUMBINI PUBLIC SCHOOL , BHUBANESWAR
Class : Class 7
If the answer is 22 then the polygon should be 14 sided.

Ans 13:

Aniket Patankar from Symbiosis International School, Pune
Class : Class 8

Ans 14:

Abhjith S Kumar from Airport Senior Secondary school Karipur, Kozhikode Intl. Airport, Kozhikode Airport
Class : Class 9
THE ANSWER SHOULD BE 20.

Ans 15:

Rick Banerjee from Calcutta Boys School, Kolkata
Class : Class 8

Ans 16:

ARNAV VIVEK PATIL from Podar International School Chalisgaon, Chalisgaon
Class : Class 7

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Aditya Patro from New Horizon Scholar School, Navi Mumbai
Subject :IMO    Class : Class 4

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Aditya Patro from New Horizon Scholar School, Navi Mumbai
Subject :IMO    Class : Class 4

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Armani from Jainendra public school, Panchkula
Subject :IMO    Class : Class 5

Ans 1:

Miraya Agarwal from School of india, Bengaluru
Class : Class 7
IT SHOULD BE 21 SQUARE 1/2 SQUARE 1/2 SQUARE

Ans 2:

Bhavya from ABC, Delhi
Class : Class 7
IT SHOULD BE 1 NOT 2. 1/2 1/2 = 1

Ans 3:

saisuhanth VARNAJYOSULA from ambassador school, dubai
Class : Class 6

Ans 4:

tanish jain from dps noida, noida
Class : Class 5
It has no sense

Ans 5:

Arunava hury from KV1 saltlake , Kolkata
Class : Class 6
D)

Ans 6:

Deepna Komath from Kendriya Vidhyalaya Kadavanthra , Ernakulam
Class : Class 5

Ans 7:

Sejal from dlf, Ghaziabad
Class : Class 10
It should be 1 not 2 because half half = 1

Ans 8:

from ,
Class : Class 5
it makes no sense

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Pranav from Ganges valley school, Hyderabad
Subject :IMO    Class : Class 8

Ans 1:

Aditi Saha from Bishops KalyaniNagar, Pune
Class : Class 4
B and D are identical It's a mistake both options are right

Ans 2:

from kv2, kalpakkam
Class : Class 9
answer is both B and D

Ans 3:

Anirudh from 989820Delhi Pubic school Rohini , Delhi
Class : Class 8
B and D are identical

Ans 4:

Sneh from The Shriram Millennium School, Noida
Class : Class 8
How can they give they two same options and mark one wrong

Ans 5:

Harsh Shukla from DPS Bangalore East, Bengaluru
Class : Class 9
It's a mistake both options are right

Ans 6:

Vartika Agarwal from Phoenix world school, Pune
Class : Class 9
its not fair if we mark option d then they say correct answer is option b and if we mark option b then they say that option d is the correct answer.

Ans 7:

Vinayak Iyer from Podar International School Powai, Mumbai
Class : Class 9

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Aditya vardhan roy from Bharatiya vidya bhavan vidyashram jaipur , Jaipur
Subject :IMO    Class : Class 7

Ans 1:

Roy N from DSB Rishikesh, Dehradun
Class : Class 8
pl give solution, very confusing question

Ans 2:

Harsh Shukla from DPS Bangalore East, Bengaluru
Class : Class 9
This can be solved like this: take length as 2x and breadth as x. Applying the pythagoras theorem, (x)^2 (2x)^2 = (9 * root 5)^2. Equal to x squared 4x squared = 9 squared * root 5 squared 5x squared = 81 * 5. 5 and 5 cancel on both sides. x squared = 81 x = 9 = breadth 2x = 18 = length perimeter = 2 (l b) 2 * 27 = 54

Ans 3:

Mehak Narang from Bluebells School International, New Delhi
Class : Class 9
explaination of answer not provide....how to check the solution??

Ans 4:

Karthikeyan from Velammal bodhi campus, Thanjavur
Class : Class 7
Sorry diagonal of a rectangle is l^2 b^2

Ans 5:

Mehul Bansal from Pawar Public School, mumbai
Class : Class 7
it is very simple and can be solved with Pythagoras.Length=2y Breadth=yroot of [(2y)square ysquare]=9 x root of 5root of [4ysquare ysquare]=9 x root of 5root of 5ysquare=9 x root of 5 = y x root of 5thus y = 9 and 2y = 18p=54

Ans 6:

Ashwin Shridhar from Vidyashilp Academy, Bangalore
Class : Class 9
give explanation please.

Ans 7:

S SAHITHYAA RAMAN from Padma Seshadri T Nagar, Chennai
Class : Class 7
please provide explanation soon

Ans 8:

Rishith Sunil from BVM global, CHENNAI
Class : Class 6

Ans 9:

Karthikeyan from Velammal bodhi campus, Thanjavur
Class : Class 7
First of all,diagonal of a rectanhle=square root of l^2 b^2,so 9×square root of 5 is square root of 81 × 5 that is 405 so here 2x is l and x is b.if i m taking l is 18 and b is 9 and squaring them we get 405 so perimeter of the rectangle is 2(18 9) that is 54.

Ans 10:

S SAHITHYAA RAMAN from Padma Seshadri T Nagar, Chennai
Class : Class 7
w=xl=2xd=9root52(l b)=?2(x 2x)=?using pythogras theorem,xsquare 4 x square=(9root5)squared5xsquare=405x square=81x=9hence substitute values with x,perimeter=54

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Trijal Kaushik from DPS Numaligarh, Golaghat
Subject :IMO    Class : Class 5

Ans 1:

Arunava hury from KV1 saltlake , Kolkata
Class : Class 6
C)

Ans 2:

Arunava hury from KV1 saltlake , Kolkata
Class : Class 6
C)

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Bhoomika from Cornerstone, Hyderabad
Subject :IMO    Class : Class 6

Ans 1:

shubh kailash chandak from poddar, washim
Class : Class 6
Answer is a

Ans 2:

Shreyasi Padihary from The Cambridge International School , Bangalore
Class : Class 7

Ans 3:

Chhavi from ,
Class : Class 6

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Bhoomika from Cornerstone, Hyderabad
Subject :IMO    Class : Class 6

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Daksh from Greenwood High, Bengaluru
Subject :IMO    Class : Class 4

Ans 1:

Nishka Agarwal from NMAJS Mumbai, Mumbai
Class : Class 4
D

Ans 2:

Advait Khanolkar from Vibhgyor, Mumbai
Class : Class 4

Ans 3:

Ayush Ku Pal from Delhi Public School, Nalconagar Angul
Class : Class 8
c

Ans 4:

Pranav Preetham from APL Global School, Chennai
Class : Class 8

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