Answer:
15 gallons to paint six fences that are small in size.
Step-by-step explanation:
Unit rate defined as the rates are expressed as a quantity 1 such as 3 miles per hour or 5 meter per seconds.
As per the statement:
It took Lou
gallons of paint to paint one fence.

Substitute the given value we have;
gallons.
We have to find how many gallons to paint six fences that are small in size.
By definition of unit rate;

Substitute the given values we have;

Therefore, 15 gallons to paint six fences that are small in size.