At first, Peter had $129 and Mark had $99. Each of them bought a skirt at the same price. Peter now has four times as much money as Mark. How much did each of them pay for the skirt?
| |
Peter |
Mark |
Difference |
| Before |
$129 |
$99 |
$30 |
| Change |
- ? |
- ? |
|
| After |
4 u |
1 u |
3 u |
Since Peter and Mark each bought a skirt at the same price, the difference in the amounts each had remains the same.
Difference in the amounts between Peter and Mark
= 4 u - 1 u
= 3 u
3 u = 129 - 99
3 u = 30
1 u = 30 ÷ 3 = 10
Amount that each of them paid for the skirt
= 99 - 10
= $89
Answer(s): $89
