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# The Difference Between Outside and Inside Surface Areas of Cylindrical Metallic Pipe 14 Cm Long is 44 M2. If the Pipe is Made of 99 Cm3 of Metal, Find the Outer and Inner Radii of the Pipe. - Mathematics

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#### Question

The difference between outside and inside surface areas of cylindrical metallic pipe 14 cm long is 44 m2. If the pipe is made of 99 cm3 of metal, find the outer and inner radii of the pipe.

#### Solution

We have to find the outer and inner radius of a hollow pipe.

Radius of outer cylinder be (r2)

Length of the cylinder(h) = 14 cm

Difference between the outer and the inner surface area is 44 cm2

So,

2πh(r2 - r1) = 44

2(22/7)(14)(r_2-r_1)=44

So,

(r2 - r1)=1/2…… (1)

So, volume of metal used is 99 cm3 , so,

pih(r_2^2-r_1^2)=99

(22/7)(14)(r_2-r_1)(r_2+r_1)=99

Use equation (1) in the above to get,

(22/7)(14)(1/2)(r_2+r_1)=99

Therefore,

(r_2+r_1)=9/2…… (2)

Solve equation (1) and (2) to get,

r_2=5/2cm

r_1=2cm

Is there an error in this question or solution?

#### APPEARS IN

RD Sharma Solution for Class 10 Maths (2018 (Latest))
Chapter 14: Surface Areas and Volumes
Ex. 14.2 | Q: 19 | Page no. 61
Solution The Difference Between Outside and Inside Surface Areas of Cylindrical Metallic Pipe 14 Cm Long is 44 M2. If the Pipe is Made of 99 Cm3 of Metal, Find the Outer and Inner Radii of the Pipe. Concept: Volume of a Combination of Solids.
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