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You could set up a proportion and cross multiply.
Example:
1 Hour X Hours
------- = -------
60 Min. 120 Min.
1 Hour is equal to the subunit of 60 Minutes. Use the same units in both denominators (bottom of fraction) and the same units in both numerators (top of fraction).
Multiply the numerator of the first fraction with the denominator of the second and set it equal to the denominator of the first fraction multiplied by the numerator of the second fraction using a variable for the missing unit (which is probably the answer you're looking for).
120(1) = 60(X)
Solve for 'X' to get the number of hours in 120 minutes.
120/60 = 2
The answer is 2 hours.
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You cannot solve a set You may be able to solve some questions about properties of a set, or the set and another set. But a set, by itself, is not something that requires or can be "solved".
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