Zoe and Barbara had $147 at first. Zoe spent
58 of her money and Barbara spent
45 of her money. Given that they had $63 left, how much did Zoe have at first?
|
Zoe |
Barbara |
Total |
Before |
8 u |
5 p |
$147 |
Change |
- 5 u |
- 4 p |
|
After |
3 u |
1 p |
$63 |
8 u + 5 p = 147 --- (1)
3 u + 1 p = 63 --- (2)
(2) x 5 15 u + 5 p = 315 --- (3)
(3) - (1)
15 u - 8 u = 315 - 147
7 u = 168
1 u = 168 ÷ 7 = 24
Amount that Zoe had at first
= 8 u
= 8 x 24
= $192
Answer(s): $192