SOLUTION: The number of minutes in an hour is the same as a number times three, minus 3.

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Question 522789: The number of minutes in an hour is the same as a number times three, minus 3.
Answer by umnikmo(75) About Me  (Show Source):
You can put this solution on YOUR website!
number of minutes in an hour is 60
the number N, so
N*3-3=60
N=21