Question

A 20 m deep well with diameter 14 m is dug up and the earth dug out is evenly spread out to form a platform
22 m x 14 m around well. Find the height of platform.
​

Answer 1

Answer:

From the given data, volume of the cylindrical well=volume of the platform

thus, πr²h=lbh

(22/7)x7x7x20 = 22x14x h (since dia=14m, r=7m)

22x140 = 22x14x h

therefore, h=10m

Height of the platform=10m