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A drum of kerosene oil is 3/4 full. When 15 litres of oil is drawn from it, it is 7/12 full. The capacity of the drum is ........

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Let Capacity of drum = a litres


(3/4 x a) - 15 = 7/12 x a

3a/4 - 7a/12 = 15

(3a-7a)/12 = 15

2a/12 = 15

a = 15 x 12/2

a = 90 litres

Capacity of drum = 90 litres.

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