Question

A drum contains 100 L of kerosene oil. Due to leakage, 1/5 L is leaked from it, how much oil is left in the drum?​

Answer 1

Let capacity of drum =x litres

Initially, drum was

$\frac{3x}{4}$

part filled

30 litres oil drawn then it become,

$\frac{7x}{12}$

part.

Now, according to question,

$\frac{3x}{4} - \frac{7x}{12} = 30$

$\frac{9x - 7x}{12} = 30$

⇒2x=360

⇒x=180 litres