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Maths Puzzle
Numerical Ability
Area and Volume
A well with 14 m inside diameter is dug 10 m deep. Earth taken out ofit, has been evenly spread all around it to a width of 21m to form an embankment. The height (in metres) of the embankment is:
Read Solution (Total 2)
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- vol of embankment = vol of earth taken out of it
let height of embankment = h
radius of earth or soil taken out of it = 14/2 = 7m
height of soil taken out = 10m
then radius of well with embankment = 21 + 7 = 28 = 28m
pi * ( (28)^2 - (7^2) ) * h = pi*(7^2 )*10
by solving we get h= 4/21 m - 9 years agoHelpfull: Yes(0) No(0)
- V = 22/7 *(14*14)/4*10=1540 m^3
D = d+2*w
D =14+2*21
D = 56
h = 1540/{22/7 * (56^2/4 - 14^2/4)}
h=2/3
- 9 years agoHelpfull: Yes(0) No(0)
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