A delivery truck uses $375 in gasoline during a 3 week period. if the truck is driven 5 days per week, how much is spent on gas each day?

We know that $375 is spent for three weeks period

One week period is 5 days, so for three weeks periods, there are 15 days in total when the truck use the gasoline.

The amount spent on gasoline for one day is $375:15 = $25