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Question

A village, having a population of 4000, requires 150 litres water per head per day. It has a tank which is 20 m long, 15 m broad and 6 m high. For how many days will the water of this tank last?


Solution

Total population of a village = 4000 
Water required for 4000 persons for one day = 150×4000=600000 litres
Length of tank (l) = 20 m
Breadth (b) = 15 m
Height (h) = 6 m
Volume of tank = l×b×h
= 20×15×6m3=1800m3
Capacity of water in the tank = 1800×1000
l = 1800000 l (1m3=1000l)
Number of days, the water will last 
= 180000060000= 3 days. 


Mathematics
RD Sharma
Standard VIII

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