5. How many cubic metres of earth must be dug out
to sink a well which is 20m deep and has a diameter
of 7 metres. If the earth so dug out is spread over
a rectangular plot 28m by 11 m, what is the height
of the platform so formed?
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Answer:
Volume of cylinder = 22/7 r*r*h
Height =20m
Diameter =7m
radius=7/2 =3.5
Volume = 22/7 *3.5*3.5*20 =770 cu cm
Area of rectangle = l*b
Area of the rectangular plot = 28 * 11 =308 sq m
Height = volume / l*b = 770/308 =2.49 = 2.5m Answer.
Explanation:
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