A cubical tank with side 50 cm is full of water. If 61 litres of water is taken out of it, the level of water in the tank will drop by:

Correct option is D

​$$\textbf{Given:} \\\text{Side of cube} = 50 \text{ cm} \\\text{Water taken out} = 61 \text{ litres} \\\textbf{Concept Used:} \\\text{Volume and water level} \\\textbf{Formula Used:} \\\text{Volume} = \text{Base area} \times \text{height} \\\textbf{Solution:} \\61 \text{ litres} = 61000 \text{ cm}^3 \\\text{Base area} = 50 \times 50 = 2500 \text{ cm}^2 \\61000 = 2500 \times h \\h = \frac{61000}{2500} \\h = 24.4 \\\textbf{Final Answer:} \\24.4 \text{ cm}$$​​