Question

- A drum of kerosene is 3/4 full. When 80 litres of kerosene is drawn from it, it remains 7/2 full. The capacity of the drum is
(a) 120 litres
(b) 135 litres
(c) 150 litres (d) 180 litres
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Answer 1

Answer:

Let the total capacity be x.

According to the question,

(3x4)−15=(7x12)

3x−604=(7x12)

3x−60(12)=(7x)×4

36x−720=28x

36x−28x=720

8x=720

x=90

Answer 2

Let the capacity of the drum be x

Therefore,

3x/4 - 7x/12 = 30

9x - 7x/12 = 30

2x = 30 * 12

2x = 360

x = 360/2

x = 120 litres (a)