Question

A drurn is one third full of water. If 60 litre more
water is required to fill it up, what is the capacity
of drum?
(A) 120 litres (B) 90 litres
(C) 60 litres
(D) 30 litres​

Answer 1

Answer:

let total capacity be x

(1/3)x+60=x

x-(1/3)x=60

(2/3)x=60

x=90ltrs

so option B is correct

Answer 2

Answer:

let's assume the capacity of drum be x.

according to 1 condition

1/3x + 60 litres = x

1/3x - x = - 60

x/3 - x = - 60

3(x/3 - x) = 3(- 60)______Multipling both sides of equation by 3.

x - 3x = - 180

- 2x = - 180

- 2x/- 2 = - 180/- 2________Dividing both sides of equation by - 2.

x = 90 ________cancel the terms.

now we had assume the value of capacity of drum as x

Hence, capacity of drum = x = 90 litres.