For this case, the first thing we must do is define a variable.
x: number of newspapers sold per week.
We now write the equation for the total of newspapers.
We have then:
![0.10 (2x) + 0.25x = 13.95](https://img.qammunity.org/2019/formulas/mathematics/college/1kodwdsog2vc9bsiz5mlea2ad73wokt0xx.png)
Rewriting we have:
![0.20x + 0.25x = 13.95 0.45x = 13.95 x = 13.95 / 0.45 x = 31](https://img.qammunity.org/2019/formulas/mathematics/college/7gwrih611fcbmsctr3cy3kw4ugr8wyitsp.png)
For Mattthew we have:
![2x = 2 (31) = 62](https://img.qammunity.org/2019/formulas/mathematics/college/iy6k41owg98yotqcgqdjvbfk8qowcpoxly.png)
For his brother:
Answer:
each boy delivers each week about:
Mattthew: 62
His brother: 31