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

90 litres.

#### Explanation:

Let the total capacity be $x$.

According to the question,
$\left(3 \frac{x}{4}\right) - 15 = \left(7 \frac{x}{12}\right)$

$\frac{3 x - 60}{4} = \left(7 \frac{x}{12}\right)$

3x-60(12)=(7x)×4

$36 x - 720 = 28 x$
$36 x - 28 x = 720$
$8 x = 720$
$x = 90$