Postal or Sorting Assistants Model Paper 9 With Solutions

Question : 21 of 100

Marks: +1, -0

A well with 14 m inside diameter is dug 10 m deep. Earth taken out of it, has been evenly spread all around it to a width of 21m to form an embankment. The height (in metres) of the embankment is:

Validate

Solution:

(b) Volume of earth taken out

=22/7×7^2×10=1540

Let height of embarkment be h.

22/7×[[21+7]^2-7^2]×h=1540

{1540×7}/{22×35×21}=2/3

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