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How many days are there in 4050min

how many minutes are there in a day

Well, both of those are good for dimensional analysis, a.k.a. "factor label method." They deal with units conversions that are familiar, and conversion factors that people already know.

How many days are there in 4050min:

4050minutes x 1hour/60minutes x 1day/24hours = days

how many minutes are there in a day:

1day x 24hours/day x 60 minutes/1hr = minutes

When you do dimensional analysis correctly, the units in the numerator are canceled by ones in the denominator and you are left with whatever you wanted to calculate.

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