Answer :
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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