Answer:
Let's start by setting up some equations based on the given information.
Let's say that Len earns x dollars in a week. Then we know that Jean earns $15 more than Len, so Jean earns x + 15 dollars in a week.
We also know that each week they spend $80 on Brawl Stars and save the rest. So if they each save s dollars per week, we can set up the following equations:
Jean: x + 15 - 80 = s
Len: x - 80 = s
We also know that when Jean saves $120, Len saves $75. So we can set up another equation based on this information:
(x + 15 - 80) * n = 120
(x - 80) * n = 75
where n is the number of weeks we're considering (in this case, 4).
Now we can solve for x:
(x + 15 - 80) * 4 = 120
-260 + 4x = 120
4x = 380
x = 95
So Len earns $95 per week, and Jean earns $15 more than that, or $110 per week.
We can also solve for s:
Jean: 95 + 15 - 80 = s
s = 30
Len: 95 - 80 = s
s = 15
So each week, Jean saves $30 and Len saves $15.
Finally, we can calculate how much they earn altogether in 4 weeks:
Jean: 4 * 110 = 440
Len: 4 * 95 = 380
Together, they earn $440 + $380 = $820 in 4 weeks.