Perry had $9.80 less than Riordan. After Perry gave $2.30 to Riordan, Riordan would have four times as much money as Perry. How much money had Riordan at first?
| |
Riordan |
Perry |
| Before |
4 u - $2.30 |
1 u + $2.30 |
| Change |
+ $2.30 |
- $2.30 |
| After |
4 u |
1 u |
Perry had $9.80 less than Riordan. If another $9.80 was given to Perry, Riordan and Perry would have the same amount at first.
4 u - 2.30 = 1 u + 2.30 + 9.80
4 u - 1 u = 2.30 + 9.80 + 2.30
3 u = 14.40
1 u = 14.40 ÷ 3 = 4.80
Amount that Riordan had at first
= 4 u - 2.30
= 4 x 4.80 + 2.30
= 19.20 + 2.30
= $21.50
Answer(s): $21.50
