Riordan had $47.80 more than Zane. After Zane had spent
79 of his money, Riordan had $117.10 more than Zane. How much money did Riordan have at first?
|
Riordan |
Zane |
More |
Before |
9 u + $47.80 |
9 u |
$47.80 |
Change |
|
- 7 u |
|
After |
9 u + $47.80 |
2 u |
7 u + $47.80 |
Riordan had $117.10 more than Zane in the end.
9 u + 47.80 - 2 u = 117.10
7 u + 47.80 = 117.10
7 u = 117.10 - 47.80
7 u = 69.30
1 u = 69.30 ÷ 7 = 9.90
Amount that Riordan had at first
= 9 u + 47.80
= 9 x 9.90 + 47.80
= 89.10 + 47.80
= $136.90
Answer(s): $136.90