Shannon and Cindy had $141 at first. Shannon spent
57 of her money and Cindy spent
45 of her money. Given that they had $42 left, how much did Shannon have at first?
| |
Shannon |
Cindy |
Total |
| Before |
7 u |
5 p |
$141 |
| Change |
- 5 u |
- 4 p |
|
| After |
2 u |
1 p |
$42 |
7 u + 5 p = 141 --- (1)
2 u + 1 p = 42 --- (2)
(2) x 5 10 u + 5 p = 210 --- (3)
(3) - (1)
10 u - 7 u = 210 - 141
3 u = 69
1 u = 69 ÷ 3 = 23
Amount that Shannon had at first
= 7 u
= 7 x 23
= $161
Answer(s): $161
