a swimming pool is 13m long and 15m wide. how many kilometres of water must be pumped into it so as to raise the level of Water by 4 metre?
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length = 13m
breadth = 15m
area = l x b
= 13 x 15
= 195m²
Water pumped = l x b x h
= area x level of water
= 195 x 4
= 780m³ (³ is cube)
∴ 780m³ of water must be filled
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