my question about (Solving a value mixture problem using a system of linear equations)
A family has two cars. During one particular week, the first car consumed 40
gallons of gas and the second consumed 15
gallons of gas. The two cars drove a combined total of 1825
miles, and the sum of their fuel efficiencies was 55
miles per gallon. What were the fuel efficiencies of each of the cars that week?