International Maths Olympiad Forum By SOF Olympiad Trainer - Page 638
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Arundhati Dasgupta from ,
Subject :IMO    Class : Class 4

Ans 1:

jefrin jabez christian from cs academy, erode
Class : Class 5
figure at the top was not clear it should be clear so that students can gain marks in a justified way

Ans 2:

Srijata Biswas from Delhi Public School Newtown, Kolkata
Class : Class 9
[D] 1000g

Ans 3:

Admin from SOF, Noida
Class : Class 10
Answer: D

Solution
The weight of 9 balls = 500 + 500 + 800 = 1800 g
Weight of 1 ball = 200 g
Weight of 5 balls = 1000g
PS: The figure may not be clear. We are replacing it with a more clear figure.

Ans 4:

Kaushik from pebble, Bangalore
Class : Class 5
The figure is not clear on right hand side it is actually 800+500+500= 1800 kg left side = 9 balls so 1 ball weight is 1800 /9 = 200 kg 5 balls = 1000 kg answer D

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vishalwahee@gmail.com from Bhatnagar International Summit, New Delhi
Subject :IMO    Class : Class 5

Ans 1:

Krishiv Goyal from Ridge Valley School, Gurgaon
Class : Class 6
640 you idiot

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Aksh Dhiman from ,
Subject :IMO    Class : Class 7

Ans 1:

SUVAMDEBNATH from KVS BAMANGACHI, Howrah
Class : Class 9
please solve

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Aksh Dhiman from ,
Subject :IMO    Class : Class 7

Ans 1:

Nandhini from Chinmaya Vidyalaya Anna Nagar, Chennai
Class : Class 7
Can you please explain how we get this answer

Ans 2:

Nandhini from Chinmaya Vidyalaya Anna Nagar, Chennai
Class : Class 7

Ans 3:

Tamajit Das from Bhavan's Tripura Vidya Mandir, Agartala
Class : Class 7
In question the phrase 'is added to itself' should be ommited. Then the answer matches with the question

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Dev Jitendra Wadhwa from DPS VADODARA, Vadodara
Subject :IMO    Class : Class 10

Ans 1: (Master Answer)

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

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Dev Jitendra Wadhwa from DPS VADODARA, Vadodara
Subject :IMO    Class : Class 10

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om subham pati from Dps ranchi, Ranchi
Subject :IMO    Class : Class 8

Ans 1:

Mukund Gupta from Jusco School South Park , Jamshedpur
Class : Class 8

Ans 2:

D PragyaTapsi from dav public school, hyderabad
Class : Class 3

Ans 3:

ADITI SACHIN RANE from LIONS DNYANPEETH KHAMGAON, KHAMGAON
Class : Class 4
from where the 12 come?

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Rameshwari from Jain English School Ambad, Ambad
Subject :IMO    Class : Class 7

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
860% of 50= (860/100)x50 and 50% of 860 is (50/100)x860

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Asmi Raniga from Indian School Ghubra, Muscat
Subject :IMO    Class : Class 8

Ans 1:

Omayr from Army Public School Yol Cantt, Dharamshala
Class : Class 8

Ans 2:

Anidroid ,Aniruddha from Modern DPS, Faridabad
Class : Class 8
6

Ans 3:

Asmi Raniga from Indian School Ghubra, Muscat
Class : Class 8
answer is coming as B in site

Ans 4:

Admin from SOF, Noida
Class : Class 10
Answer:C

Solution
Work done by A in 1 day = 1/9
Work done by B in 1 day = 1/9 + 50% of 1/9 = 3/18 = 1/6
Days needed by B to complete the work = 6 days

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Yash Mehta from GIIS, Singapore
Subject :IMO    Class : Class 4

Ans 1: (Master Answer)

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

Ans 2:

Tathagat Sahoo from Tathagat Sahoo, Pune
Class : Class 4
It should be 5. 3 removed from center triangle and 2 joining the top of the 3 triangle on the bottom there remains 4 triangles : 3 on the bottom and 1 outer triangle

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