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In bikes it's more common to count teeth rather than sprocket diameters. But if the smaller wheel is half the size it'll turn twice as many times.

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Q: How many times does a small gear of 10cm in diameter turns if a big gear of 20cm in diameter turns once in a bicycle?
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Charmaine races her bicycle for 333ft A wheel of her bicycle turns 37 times as the bicycle travels this distance What is the diameter of the wheel?

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