Question

A tank is quarter filled with water. If 12 litres of water is added to it, it becomes two-fifth filled. What is the capacity of the tank?

• A. 120 litres
• B. 80 litres
• C. 100 litres
• D. None of the above

Answer 1

The correct option is B 80 litres

Let the capacity of the tank be = C
Then, $\frac{1}{4}C+12=\frac{2}{5}C\Rightarrow (\frac{2}{5}-\frac{1}{4})C=12$
$\Rightarrow$ $C=12\times \frac{20}{3}=80$ Litres