Question 29

A rope makes 125 rounds of a cylinder with base radius 15 cm. How many times can it go round a cylinder with base radius 25 cm?

Solution

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Let the required number of rounds be x.

More radius, less rounds (Inverse Proportion)

Radius in cm ==  Round

15 == 125

25 == x

⟹ x=(15 * 125)/25 = 75 rounds

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