Question

A well with 10 m diameter is dug to 14 m deep.Earth taken out of it is spread all around to a width of 5 m to form an embarkement.

Answer 1

Radius of well = 5 m
depth = 14 m
volume of earth taken out = πr² h = π×(5)²×14= 1100 m³
inner radius, r= 5 m
outer radius = 5 +5 = 10 m
height= h
then, 1100 = π×h(10²- 5²)
⇒h = 350/75 = 14/3 = 4.67 m