how many cubic metres of earth must be dug out to sink a well which is 20 cm deep and has a diameter of 7m . if the earth so dug out is spread over a rectangular plot 28m by 11m what is the height of the platform so formed?
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We first get the volume of the soil dug out by getting the volume of the hole dug.
Volume=3.142×3.5^2×20=769.79
769.79m3
The area of the field is=28×11=308m2
The soil level =769.79/308=2.499m
2.499m
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