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- 3 years ago
Three days because there are 24 hours per day (24+24+24=72)

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- RaymondLv 73 years ago
1 day = 24 hours

divide by "day" on both sides

1 = 24 hours/day

Multiplying or dividing by "1" never changes the value. So use that trick.

72 hours

= 72 hours / 1

= 72 hours / (24 hours/day)

dividing by a fraction = multiply by the reciprocal (flip the fraction)

= 72 hours * (day / 24 hours)

You treat the units the same way you treat numbers.

There are "hours" above and below = they cancel out.

= 72 * day / 24

Now deal with the numbers

= (72/24) day = (6/2) day = 3 days

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- Anonymous3 years ago
3 days.

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