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The difference between the outside and t...

The difference between the outside and the inside surface area of a cylindrical pipe 14 cm long is `44 cm^2`. The pipe is made of `99 cm^3` of metal. If R is the outer radius and r is the inner radius of the pipe, then what is (R + r) equal to?

A

9 cm

B

7.5 cm

C

6 cm

D

4.5 cm

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