Question

A van can travel 18 miles on each gallon of gasoline. At that rate how many miles can the van travel on 15 gallons of gadoline

Answer 1

36 miles.

Because,

2 gallons to another 18 = 36 miles

Answer 2

If 18 miles is the unit rate, you would multiply 18 and 15. 270. The new rate would simply be 270 miles for every 15 gallons of gasoline.