International Maths Olympiad Forum By SOF Olympiad Trainer - Page 622
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adwaita from DPS NOIDA, Noida
Subject :IMO    Class : Class 4

Ans 1: (Master Answer)

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

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Kushagra Gupta from Primus Public School, Bengaluru
Subject :IMO    Class : Class 4

Ans 1:

aarav from GURUKUL THE SCHOOL, GHAZIABAD
Class : Class 7
answer is 11/20 as if unshaded is less than 1/2 we take it as 1/2 if it is more than 1/2 then we take it as 1 but if it is 1/2 we take it as 1/2 now count all of unshaded boxes you will get the answer

Ans 2:

Oscar Maltman from DBSEH, dubai
Class : Class 7

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SWASTIK from JANKIDAS KAPUR PUBLIC SCHOOL, SONEPAT
Subject :IMO    Class : Class 8

Ans 1:

Dr Anupa Ghosh from ,
Class : Class 8
Relative velocity of two trains is 384km/hr=320/3 m/sec. Therefore,it can travel 1600m in 15 sec. Therefore, the length of the second train is (1600-600)m=1000m

Ans 2:

Anidroid ,Aniruddha from Modern DPS, Faridabad
Class : Class 8
Add up the speeds and multiply with time as trains are in opposite directions.Then subtract the length of the first train. Ans -1000m

Ans 3:

Anidroid ,Aniruddha from Modern DPS, Faridabad
Class : Class 8
1000m

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SWASTIK from JANKIDAS KAPUR PUBLIC SCHOOL, SONEPAT
Subject :IMO    Class : Class 8

Ans 1:

Samedh from Tree House High School, Pune
Class : Class 9
Let the ages of A, B and C be a years, b years and c years respectively. (a + b) is 12 greater than (b + c) => 12 + b + c = a + b => 12 + c = a => 12 = a - c So, C is younger than A by 12 years Answer is A

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Kushagra Gupta from Primus Public School, Bengaluru
Subject :IMO    Class : Class 4

Ans 1:

Nisha Toshniwal from GIIS, Pune
Class : Class 4

Ans 2:

Shaurya Veer from Blooming Dales International School, Sri Ganganagar
Class : Class 8

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Adiammu from RGS, USA
Subject :IMO    Class : Class 3

Ans 1: (Master Answer)

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

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Mayank Jajodia from New Horizon Scholars School, Thane
Subject :IMO    Class : Class 3

Ans 1:

Aarush Shivde from Orchid International School, THANE
Class : Class 8
i do not understand!!!!!!!!!!

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SWARA SHEDGE from ARYA VIDYA MANDIR, JUHU, Mumbai
Subject :IMO    Class : Class 6

Ans 1:

Ojaswi from SAINT JOHNS CONVENT SCHOOL LANSDOWNE, DELHI
Class : Class 4
Answer should be B. Because BE divides the triangle ABC into two equal triangle.

Ans 2:

Rijrashwa Sreejith from Devamatha C M I Public School, Thrissur
Class : Class 9
AB =BC So BE is the answer

Ans 3:

Aaditya Jain from Jaypee public school, Greater noida
Class : Class 8
YES TRUE

Ans 4:

Eshaan from The Amaatra academy, Bengaluru
Class : Class 7

Ans 5:

Ishir Jha from Gyan Ganga Global Academy, Rosera
Class : Class 8
it should be B

Ans 6:

geet_adi from SSRVM, Bengaluru
Class : Class 5
It has to be BE. The given coondition is AB =BC not AB=AC

Ans 7:

harry potter from hogwarts, hogsmeade
Class : Class 6

Ans 8:

NYRAH GUPTA from Sat Paul Mittal School, Ludhiana
Class : Class 7
the ans is B

Ans 9:

Aayushi from Best English school, Ahmedabad
Class : Class 6

Ans 10:

chittaranjan kar from MLZS, Jaipur
Class : Class 3
Ans should be B with AB=BC as per question given.

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Swarup from HUS, Chennai
Subject :IMO    Class : Class 7

Ans 1:

SUVAMDEBNATH from KVS BAMANGACHI, Howrah
Class : Class 9
how

Ans 2:

Nandhini from Chinmaya Vidyalaya Anna Nagar, Chennai
Class : Class 7
Can you please explain the reason

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SWARA SHEDGE from ARYA VIDYA MANDIR, JUHU, Mumbai
Subject :IMO    Class : Class 6

Ans 1:

Eshaan from The Amaatra academy, Bengaluru
Class : Class 7
ans is b

Ans 2:

Ishir Jha from Gyan Ganga Global Academy, Rosera
Class : Class 8
don't understand the q

Ans 3:

Manasvi from MVM School, Hyderabad
Class : Class 6

Ans 4:

Sejal Mittal from dlf, ghaziabad
Class : Class 6
SolutionPutting a = 4q and b = 3q in a * b = (3a 2b)/(3a – 2b).(4q * 3q) = [3(4q) 2(3q)]/ [3(4q) - 2(3q)]= (12q 6q) / (12q – 6q)= 18q/6q = 3So, 5p * (4q * 3q) = 5p * 3Put p= 1/5 in 5p * 3we get 5 x 1/5 * 3 = 1 * 3= [3(1) 2(3)]/ =[3(1) - 2(3)]= (3 6)/(3 – 6)= 9/-3 = - 3Answer-(C) - 3

Ans 5:

HARSH from ANAND NIKETAN, Ahmedabad
Class : Class 6
can not understand

Ans 6:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 7:

chetan malviya from atul vidyalaya, valsad
Class : Class 8
the question is not complete

Ans 8:

Avni from Dbs, firozpur
Class : Class 7
it is option c

Ans 9:

Aaditya Jain from Jaypee public school, Greater noida
Class : Class 8
please explain someone why to put a=3q and b=4q

Ans 10:

Krish from GEMS Modern Academy, Dubai
Class : Class 8
What happened to q=3 they didn’t do anything with that. They should have multiplied 4q and 3q by 3 before solving the question.

Ans 11:

Parth from Dlf public school, Sahibabad
Class : Class 6

Ans 12:

Krish from GEMS Modern Academy, Dubai
Class : Class 8

Ans 13:

Manasvi from MVM School, Hyderabad
Class : Class 6

Ans 14:

Shriya Prakash from NPS International, Singapore
Class : Class 6

Ans 15:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar
Class : Class 4
Putting a = 4q and b = 3q in a * b = (3a 2b)/(3a – 2b). (4q * 3q) = [3(4q) 2(3q)]/ [3(4q) - 2(3q)] = (12q 6q) / (12q – 6q) = 18q/6q = 3 So, 5p * (4q * 3q) = 5p * 3 Put p= 1/5 in 5p * 3 we get 5 x 1/5 * 3 = 1 * 3 = [3(1) 2(3)]/ =[3(1) - 2(3)] = (3 6)/(3 – 6) = 9/-3 = - 3 Answer-(C) - 3

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