Zoe and Irene had equal amount of money. Each day, Zoe spent $18 and Irene spent $21. When Zoe had $120 left, Irene had
15 as much money left as Zoe. How much money did the two girls have at first?
| |
Zoe |
Irene |
| Before |
18 u + 120 |
21 u + 24 |
| Change |
- 18 u |
- 21 u |
| After |
$120 |
$24 |
Amount that Irene had left
=
15 x 120
= $24
The amount that Zoe and Irene had at first is the same.
21 u + 24 = 18 u + 120
21 u - 18 u = 120 - 24
3 u = 96
1 u = 96 ÷ 3 = 32
Amount that Zoe had at first
= 18 u + 120
= 18 x 32 + 120
= 576 + 120
= $696
Total amount that both girls had at first
= 2 x 696
= $1392
Answer(s): $1392
