Kimberly and Risa had $65 at first. Kimberly spent
57 of her money and Risa spent
45 of her money. Given that they had $76 left, how much did Kimberly have at first?
| |
Kimberly |
Risa |
Total |
| Before |
7 u |
5 p |
$65 |
| Change |
- 5 u |
- 4 p |
|
| After |
2 u |
1 p |
$76 |
7 u + 5 p = 65 --- (1)
2 u + 1 p = 76 --- (2)
(2) x 5 10 u + 5 p = 380 --- (3)
(3) - (1)
10 u - 7 u = 380 - 65
3 u = 315
1 u = 315 ÷ 3 = 105
Amount that Kimberly had at first
= 7 u
= 7 x 105
= $735
Answer(s): $735
