Zoe and Irene had equal amount of money. Each day, Zoe spent $16 and Irene spent $20. When Zoe had $84 left, Irene had
17 as much money left as Zoe. How much money did the two girls have at first?
| |
Zoe |
Irene |
| Before |
16 u + 84 |
20 u + 12 |
| Change |
- 16 u |
- 20 u |
| After |
$84 |
$12 |
Amount that Irene had left
=
17 x 84
= $12
The amount that Zoe and Irene had at first is the same.
20 u + 12 = 16 u + 84
20 u - 16 u = 84 - 12
4 u = 72
1 u = 72 ÷ 4 = 18
Amount that Zoe had at first
= 16 u + 84
= 16 x 18 + 84
= 288 + 84
= $372
Total amount that both girls had at first
= 2 x 372
= $744
Answer(s): $744
