Q27 of 40 Page 1

500 persons are taking dip into a cuboidal pond which is 80 m long and 50 m broad. What is the rise of water level in the pond, if the average displacement of the water by a person is 0.04m3 ?

Raise in water level by 1 person = 0.04m3

Raise in water level by 500 persons = 500 × 0.04 = 20 m3


Now, let the raise in water level be ‘h’ m.


∴ Volume of raise in water = Length of pond × breadth of pond × raise in water


⇒ 20 = 80 × 50 × h




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