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 x 14 m. Find the height of
the platform.​

Answer 1

Step-by-step explanation:

according to the question volume of the well (cylinder) = volume of platform ( cuboid)

volume of cylinder = 22/7× (diameter )^2/4 × height

= 22/7 × 7 ×7/4 ×20

= 77/2×20

= 770

volume of cuboid = length × breadth × height

= 22×14×h

770=22×14×h

h = 2.5m

Answer 2

#==pi

#r2h=l×b×h

22÷7×7÷2×7÷2=22×14×h

770÷22×14=h

55÷22=h

2.5=h