Question

A family has two cars. During one particular week, the first car consumed

40

gallons of gas and the second consumed
25

gallons of gas. The two cars drove a combined total of
1350

miles, and the sum of their fuel efficiencies was
45

miles per gallon. What were the fuel efficiencies of each of the cars that week?

Answer 1

25x+40(45-x)=1350
Solve for x
X=30 for the second car

45-30=15 for the first car