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 40 miles per gallon of gas. During one particular week, the two cars went a combined total of 1700 miles, for a total gas consumption of 55 gallons. How many gallons were consumed by each of the two cars that week
F= first car S = second car F+S =55 F= 55-S 20f+40s=1700 Using substitution method add the value of F to second equation 20(55-s)+40s=1700 1100-20s+40s=1700 1100+20s=1700 20s=600 s=30 So second car consumed 30 gallons of gas; first car consumed 25 gallons
