3. a vehicle uses 15 gallons of gasoline to travel 13 miles. at this rate, how many miles can the
vehicle travel per gallon of gasoline?

Vehicle can travel 13/15 = 0.87 miles per gallon

Step-by-step explanation:

Using Direct ratio as increase of fuel increases mileage

gallons                                   miles

15                                             13

1                                                x

applying cross product

x*15=13*1

x= 13/15 miles or 0.87 miles