International Maths Olympiad Forum By SOF Olympiad Trainer - Page 622

# User Forum Subject :IMO    Class : Class 4

## Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

Subject :IMO    Class : Class 4

## Ans 1:

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:

Class : Class 7

Subject :IMO    Class : Class 8

## Ans 1:

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:

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:

Class : Class 8
1000m

Subject :IMO    Class : Class 8

## Ans 1:

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

Subject :IMO    Class : Class 4

Class : Class 4

## Ans 2:

Class : Class 8

Subject :IMO    Class : Class 3

## Ans 1: (Master Answer)

Class : Class 1
The correct answer is B.

Subject :IMO    Class : Class 3

## Ans 1:

Class : Class 8
i do not understand!!!!!!!!!!

Subject :IMO    Class : Class 6

## Ans 1:

Class : Class 4
Answer should be B. Because BE divides the triangle ABC into two equal triangle.

## Ans 2:

Class : Class 9
AB =BC So BE is the answer

Class : Class 8
YES TRUE

Class : Class 7

Class : Class 8
it should be B

## Ans 6:

Class : Class 5
It has to be BE. The given coondition is AB =BC not AB=AC

Class : Class 6

Class : Class 7
the ans is B

Class : Class 6

## Ans 10:

Class : Class 3
Ans should be B with AB=BC as per question given.

Subject :IMO    Class : Class 7

Class : Class 9
how

## Ans 2:

Class : Class 7
Can you please explain the reason

Subject :IMO    Class : Class 6

Class : Class 7
ans is b

## Ans 2:

Class : Class 8
don't understand the q

Class : Class 6

## Ans 4:

Class : Class 6
SolutionPutting a = 4q and b = 3q in a * b = (3a 2b)/(3a â 2b).(4q * 3q) = [3(4q) 2(3q)]/ [3(4q) - 2(3q)]= (12q 6q) / (12q â 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 â 6)= 9/-3 = - 3Answer-(C) - 3

## Ans 5:

Class : Class 6
can not understand

Class : Class 10

## Ans 7:

Class : Class 8
the question is not complete

Class : Class 7
it is option c

## Ans 9:

Class : Class 8
please explain someone why to put a=3q and b=4q

## Ans 10:

Class : Class 8
What happened to q=3 they didnât do anything with that. They should have multiplied 4q and 3q by 3 before solving the question.

Class : Class 6

Class : Class 8

Class : Class 6

Class : Class 6

## Ans 15:

Class : Class 4
Putting a = 4q and b = 3q in a * b = (3a 2b)/(3a â 2b). (4q * 3q) = [3(4q) 2(3q)]/ [3(4q) - 2(3q)] = (12q 6q) / (12q â 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 â 6) = 9/-3 = - 3 Answer-(C) - 3