A village having population of 4000 requires 150 litres of water per head per day. It has a tank measuring 20m x 15m x 6m. The water of this tank will last for:
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Volume of tank = 20 x 15 x 6 cubic metre
= 20 x 15 x 6 x 1000 litre
The water in the tank last for = (20 x 15 x 6 x 1000) divided by (150 x 4000)
= 3 days.