One-fourth of a tank holds 135 litres of water. What part of the tank is full if it contains 180 litres of water?\nOptions:\n(A) 1/2\n(B) 1/3\n(C) 1/5\n(D) 1/6\n(E) 1/4
A step-by-step solution is:
(B)
135 litres = 1/4 of tank\n180 litres = 1/4 x 180/135 = 1/3.

The final answer: (B)