A rectangular water tank measures 15m x 6m at top and is 10m deep. It is full of water. If water is drawn out lowering the level by 1 meter, how much of water has been drawn out?
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Water drawn out of tank = Initial volume of tank – Final volume of the tank
= {[15x6x10] – [15x6x(10-1)]}
= {[15x6x10] – [15x6x9]}
= 15x6x1
= 90 cubic metre
= 90 x 1000 literes
= 90000 litres