every week henry gets $2.50 more for his allowance than jimmy does. They spend $6 on snacks and save the rest. Henry saves $72, but jimmy saves only $52. How many weeks does it take henry to save $72? How much money does jimmy get every week?
h = j + 2.50
Does each spend $6 on snacks? If so, the amount saved each week is h-6 and j-6.
After n weeks, h has saved $20 more than j. Since h-j=2.50, h saves 2.50 more than j each week. It will take 8 weeks for the difference to grow to $20.
Since h has saved $72 in 8 weeks, he saves $9 every week. j saves only $6.50 per week, making $52 in 8 weeks.
So, Jimmy gets $12.50/week
Henry gets $15.00/week