A 20 m deep well with diameter 7 m is dug and the earth from digging i

1.	A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form platform 22 m by 14 m. Find the height of the platform.
Answer» Diameter of the well = 7 mRadius of the well = 7/2 mDepth of the well = 20 m Volume of the mud dug from the well = πr2h= 22/7 × 7/2 × 7/2 × 20= 770 m3 Area of the rectangular plot where the mud is spread = 22 x 14Let the height of the plotfarm be h metres. Volume of the plot form = Volume of the mud taken from the well22 x 14 x h = 770h = 770 / 22x14h = 2.5 m

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

Answer»

Diameter of the well = 7 mRadius of the well = 7/2 mDepth of the well = 20 m

Volume of the mud dug from the well = πr2h= 22/7 × 7/2 × 7/2 × 20= 770 m3

Area of the rectangular plot where the mud is spread = 22 x 14Let the height of the plotfarm be h metres.

Volume of the plot form = Volume of the mud taken from the well22 x 14 x h = 770h = 770 / 22x14h = 2.5 m