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1 hour = 60 minutes.

Half an hour = 60/2 = 30 minutes.

30 minutes = 30/3 = 10 turns on a 3-minute timer PROVIDED the timer is turned at exactly the right moment and turning the timer takes no time at all.

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is twenty prime or composite
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Q: How many times must a three-minute timer be flipped to measure a half hour?
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