Question

A 20m deep well with diameter 7 m. is dug and the earth from digging is evenly spread out to form a platform 22 m. by 14 m. Find the height of the platform.

Answer 1

Given, height of the well=20m

Diameter =7m=7/2m

Volume of the well= pir2h

=22/7×7/2×7/2×20

=22×7×5m

=770m3

Now, Lenght of the plot =22m

Breadth of the plot =14 m

Area =l×b

=14×22

=308m2

Therefore, Height of the platform formed =Volume of well/area of plot

=770/308=2.5m

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