Question

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

Answer 1

2.5 m will be tje answer

Answer 2

depth of well
$= 20m$
diameter
$= 7m$
radius
$= \frac{diameter}{2} = \frac{7}{2 } = 3.5m$
So,
Volume of well
$= \pi \: {r}^{2}h = \pi \times {3.5}^{2} \times 20 = 770 {m}^{3}$
Volume of well will be same as the soil spread
Hence,
$22 \times 14 \times h = 770$
$h = \frac{770}{22 \times 14}$
$h = 2.5m$
Height of platform
$= 2.5m$