50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is 4 cu.m , then the rise in the water level in the tank will be:
Total volume of water displaced =(4 x 50) cu.m = 200 cu.m
Rise in water level = 20040×20=0.25m = 25cm
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If the edge of a cube is increased by 4 cm, the volume will increase by 988 . Then the original length of each edge of the cube is
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