# User Forum

Subject :IMO    Class : Class 9

## Ans 1:

Class : Class 9
d = 75% of old d ..... => r = 75 %of old r..... volume of sphere =4/3 *pi*r*r*r...... new= 4/3*pi*r*r*r*27/64..... 4/3*pi*r*r*r will cancel out..... volume(new) =27/64 of old, decreased by 37/64, % =37/64*100=3700/64=37*25/16 = 57.81.... therefore answer is opt (D) .....hope you understood!!!!!

Subject :IMO    Class : Class 6

## Ans 1:

Class : Class 3
B

Subject :IMO    Class : Class 4

Class : Class 9
C

## Ans 2:

Class : Class 4
This makes no sense!!!

## Ans 3:

Class : Class 7
c

Subject :IMO    Class : Class 4

Subject :IMO    Class : Class 5

## Ans 1:

Class : Class 9
they should learn HCFthe answer is 15 and not 12have not counted another 3

Class : Class 5

Class : Class 5
C

## Ans 4:

Class : Class 9

Subject :IMO    Class : Class 3

Class : Class 3

## Ans 2:

Class : Class 3
1 cube = 3 cones = 9 kgs. So 2 cubes 18 kgs

Subject :IMO    Class : Class 7

Class : Class 7

## Ans 2:

Class : Class 9
All fruits together = 100% OR x Apples = 30% of x OR 30/100 of x = 3/10 x Oranges= 50% of (x - 3/10 x) OR 1/2 of (x - 3/10 x) = 1/2 of 7/10 x = 7/20 x Pears = 20/20(All Fruits) - {6/20(Apples) + 7/20(Oranges)} = 20/20 - 13/20 = 7/20 Therefore it is clear that 7/20 of all fruits is pears. Hope this was helpful!

Subject :IMO    Class : Class 3

Subject :IMO    Class : Class 6