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# Solution for A 16m deep well with diameter 3.5m is dug up and the earth from it is spread evenly to form a platform 27.5m by 7m. Find height of platform? - CBSE Class 10 - Mathematics

ConceptVolume of a Combination of Solids

#### Question

A 16m deep well with diameter 3.5m is dug up and the earth from it is spread evenly to form a platform 27.5m by 7m. Find height of platform?

#### Solution

Let as assume well is a solid right circular cylinder

us of cylinder(r) = 3.5/2 = 1.75m

Height (or) depth of well = 16m.

Volume of right circular cylinder = πr2h

= 22/7 x (1.75)2 X 16            .............(1)

Given that length of platform(l) = 27.5m

Breath of platform (b) = 7cm

Let height of platform be xm

Volume of rec tan gle = lbh

= 27.5 x 7 x x= 192.5x         ..........(2)

Since well is spread evenly to form platform

So equating (1) and (2)

V1V2

⇒ 22/7(1.75)x 16 = 192.5x

⇒ x= 0.8m

∴ Height of platform(h) = 80cm.

Is there an error in this question or solution?

#### APPEARS IN

RD Sharma Solution for 10 Mathematics (2018 to Current)
Chapter 14: Surface Areas and Volumes
Q: 10
Solution A 16m deep well with diameter 3.5m is dug up and the earth from it is spread evenly to form a platform 27.5m by 7m. Find height of platform? Concept: Volume of a Combination of Solids.
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