a family has 2 cars

Question

A family has two cars. The first car has a fuel efficiency of 30

 miles per gallon of gas and the second has a fuel efficiency of 15

 miles per gallon of gas. During one particular week, the two cars went a combined total of 1275

 miles, for a total gas consumption of 55

 gallons. How many gallons were consumed by each of the two cars that week?

Answer 1

x represents the gallons that high efficiency car consummed

55 - x represents the gallons that low efficient car consummed

30x + 15(55 - x) = 1275

Can you solve for x and answr?