Question

31. A well with 14m diameter is dug 8m deep. The earth taken out of it has been evenly spread all
around it to a width of 3.5m to form an embankment. Find the height of the embankment.
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Answer 1

Answer:

We have,

r=7m and h=8m

Let the height of the embankment be H metre. We observe that:

Volume of the earth in embankment=Volume of earth dugout

722×(282−72)×H=722×72×8

⇒35×21×H=72×8

⇒H=35×217×7×8m=158m=15800cm=53.3cm.

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