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Q.

If the radius and height of a cylinder are in the ratio 5:7  and its volume is 550 cm3 ,  then its radius is

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a

6 cm

b

5 cm

c

4 cm

d

52 cm

answer is B.

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Detailed Solution

Given r:h=5:7

v=550 cm3⇒πr2h=550

⇒227.5x.5x.7x=550

⇒x3=1

⇒x=1

∴ radius =5 cm

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