Question:A rope makes `70` rounds of the circumference of a cylinder whose radius of the base is `14` cm. How many times can it go round a cylinder with radius `20` cm ? 

A `40` 
B `49` 
C `100` 
D None of these 

+ Answer
B 

+ Explanation
More Radius, less rounds (Indirect)

`20 : 14 :: 70 : x` or

`20x = 14 xx 70` or

`x = ((14 xx 70)/(20))`

`= 49`.

`:.` Required number of rounds `= 49`.

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Md. Habib Ullah

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