A well with 14m diameter is dug 8m deep. The earthtaken out of it has – InterviewSolution

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1.	A well with 14m diameter is dug 8m deep. The earthtaken out of it has been evenly spread all around it to a width of 21m toform as embankment. Find the height of the embankment.
Answer» Volume of earth taken out`=pir^2h` `=392pi` `r_(outer)`=21+7=28m `r_(i n n e r)`=7cm Volume of embankment=Volume of earth taken out `h(pi(28^2-7^2))=392pi` `h=0.533m`.

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