Final answer:
Joshua sold 30 newspapers.
Step-by-step explanation:
Let's assume that Joshua sold x newspapers and Ron sold y newspapers.
According to the given ratio, x:y = 5:3.
After Ron sold 28 more newspapers in the evening, the ratio becomes x:(y+28) = 10:13.
Using the first ratio, we can write the equation: 5/3 = x/y.
Using the second ratio, we can write the equation: 10/13 = x/(y+28).
Now, we can solve these equations to find the values of x and y. Multiplying the first equation by 10 and the second equation by 5, we have:
- 10/3 = (10/13) * x
- 50/13 = (5/3) * x
Simplifying these equations, we get:
Therefore, Joshua sold 30 newspapers.