Question

A 20 m 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

Radius of well, ‘r’ = 3.5 m. Height of well, h = 20 m. (i) Volume of soil dug out of well, V = πr2h(∵ cylinder sphere) = 770m3 (ii) Length of platform, l = 22 m. Breadth, b = 14 m. Height, h = ? Volume of Platform, V= l × b × h (∵ Cuboid) = 22 × 14 × h ∴ Volume of Platform = Volume of soil dug out of well. ∴ Height of platform is 2.5 mRead more on Sarthaks.com - https://www.sarthaks.com/666444/a-20-deep-well-with-diameter-7-m-is-dug-and-the-earth-from-digging-is-evenly-spread-out-to-form