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प्रश्न
A village, having a population of 4000, requires 150 litres of water per head per day. It has a tank measuring 20 m × 15 m × 6 m. For how many days will the water of this tank last?
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उत्तर
The given tank is cuboidal in shape having its length (l) as 20 m, breadth (b) as 15 m, and height (h) as 6 m.
Capacity of tank = l × b× h
= (20 × 15 × 6) m3
= 1800 m3
= 1800000 litres
Water consumed by the people of the village in 1 day = (4000 × 150) litres = 600000 litres
Let water in this tank last for n days.
Water consumed by all people of village in n days = Capacity of tank
n × 600000 = 1800000
n = 3
Therefore, the water of this tank will last for 3 days.
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