Question

A well of inner diameter 14 m is dug to a depth of 12 m. Earth taken out of it has been evenly spread all around it to a width of 7 m to form an embankment. Find the height of the embankment so formed.

Answer 1

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Your answer goes like this ...

GIVEN THAT:- Width of the embankment=7m
                         It"s Inner Radius {r}=7m and outer Radius{R}=7=7=14m.


      Volume of the earth dug out=Volume of the soil in embankment 
       $\pi$r²h=Volume of soil in the embankment
       22/7X7²X12000=$\pi$h[R²-r²]
        1484000=22/7XhX[14²-7²]
        1484000=7/22=hX147
         h=84000X7/147
        h=588000/147   
        h=4000metres.

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Answer 2

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