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Say you had to turn 9/30 in to twentieths. First you find the common denominator of 30 and 20 (the lowest thing that both of them multiply into) and then multiply the first number into it. So 9/30 would turn into 18/60, which you can then divide by 3 to get twentieths, which is 6/20.
A whole turn is 360 degrees = 360*60 = 21600 minutes So a turn of 20 minutes is 20/21600 = 1/1080
6 out of 20 is 30%.
20-6 = 14
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