David had four times as much money as Charlie. After David spent $129 and Charlie spent $21, they had the same amount of money left.
- How much did Charlie have at first?
- How much had each of them left in the end?
|
David |
Charlie |
Before |
4 u |
1 u |
Change |
- 129 |
- 21 |
After |
4 u - 129 |
1 u - 21 |
The amounts that David and Charlie had left in the end is the same.
4 u - 129 = 1 u - 21
4 u - 1 u = 129 - 21
3 u = 108
1 u = 108 ÷ 3 = 36
Amount that Charlie had at first
= 1 u
= $36
(a)
Amount that each of them had in the end
= 36 - 21
= $15
Answer(s): (a) $36; (b) $15