Question:A circular road runs round a circular ground. If the difference between the circumference of the outer circle and inner circle is 66 metres, the width of the road is : 

A `5.25 m` 
B `7 m` 
C `10.5 m` 
D `21 m` 

+ Answer
C 

+ Explanation
`2 (R - r) = 60 =>2 xx 22/7 xx (R - r) = 60`

`:. (R - r) = (66 xx 7/44)`

`= 10.5 m.`

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Irin Moni

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