A family has two cars. The first car has a fuel efficiency of 20 miles per gallon of gas and the second has a fuel efficiency of 25 miles per gallon of gas. During one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 45 gallons. How many gallons were consumed by each of the two cars that week?

Question

A family has two cars. The first car has a fuel efficiency of  20  miles per gallon of gas and the second has a fuel efficiency of  25  miles per gallon of gas. During one particular week, the two cars went a combined total of  1025  miles, for a total gas consumption of  45  gallons. How many gallons were consumed by each of the two cars that week?

dumbcow · Answer

x + y = 45    -------> y = 45-x
20x + 25y = 1025

solve with substitution