Winnie and Xylia had equal amount of money. Each day, Winnie spent $12 and Xylia spent $21. When Winnie had $90 left, Xylia had
15 as much money left as Winnie. How much money did the two girls have at first?
| |
Winnie |
Xylia |
| Before |
12 u + 90 |
21 u + 18 |
| Change |
- 12 u |
- 21 u |
| After |
$90 |
$18 |
Amount that Xylia had left
=
15 x 90
= $18
The amount that Winnie and Xylia had at first is the same.
21 u + 18 = 12 u + 90
21 u - 12 u = 90 - 18
9 u = 72
1 u = 72 ÷ 9 = 8
Amount that Winnie had at first
= 12 u + 90
= 12 x 8 + 90
= 96 + 90
= $186
Total amount that both girls had at first
= 2 x 186
= $372
Answer(s): $372
