Carl had three times as much money as Justin. After Carl spent $129 and Justin spent $31, they had the same amount of money left.
- How much did Justin have at first?
- How much had each of them left in the end?
|
Carl |
Justin |
Before |
3 u |
1 u |
Change |
- 129 |
- 31 |
After |
3 u - 129 |
1 u - 31 |
The amounts that Carl and Justin had left in the end is the same.
3 u - 129 = 1 u - 31
3 u - 1 u = 129 - 31
2 u = 98
1 u = 98 ÷ 2 = 49
Amount that Justin had at first
= 1 u
= $49
(a)
Amount that each of them had in the end
= 49 - 31
= $18
Answer(s): (a) $49; (b) $18