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A well with 3 m inside diameter is dug 14m deep earth taken out of its is spread all around to width of 4m to form an embankment find the height of



Answer is in the pic below....
Diagram is also given......

hope it is correct

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Volume of Earth Taken Out = Volume Of Embakment
                          Πr²h            = Πh(R²- r²)
                     22/7×3×3×14  =22/7×h(7²-3²)
                      22×3×3×2      =22/7×h(49-9) 
                       22×3×3×2×7/22     =  40h
                                            h  = 22×3×3×2×7/40×22
                                            h  = 3.15 m
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