Question

a milk container is 5/ 8 full .when 10 litres of milk is drawn off from it, it become half full. find the capacity of the container.

Answer 1

Let it be x units.

Therefore
5/8x - 10 = 1/2x
10 = 5/8x - 4/8x
=> 10 = 1/8 x
=> 80ml = x

This the capacity is 80 units (ml/l).

Answer 2

let the capacity be x litres
by the given cond, 
5x/8  - 10 = 1x/2 
5x/8- 1x/2 = 10
5x - 4x/8= 10
x/8 =10
x = 80 litres