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Question
The diameter of a wheel is 40 cm. How many revolutions will it make in covering 176 m?
Options
140
150
160
166
Solution
140
Distance covered by the wheel in 1 revolutio = πd
`=(22/7xx40)"cm"`
`= 880/7 "cm"`
`=880/(7xx100) "m"`
Number of revolutions required to cover 176 m`=(176/(880/(7xx100)))`
`= (176xx100xx7/880)`
= 140
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