Hilda and Roshel had equal amount of money. Each day, Hilda spent $15 and Roshel spent $25. When Hilda had $90 left, Roshel had
13 as much money left as Hilda. How much money did the two girls have at first?
| |
Hilda |
Roshel |
| Before |
15 u + 90 |
25 u + 30 |
| Change |
- 15 u |
- 25 u |
| After |
$90 |
$30 |
Amount that Roshel had left
=
13 x 90
= $30
The amount that Hilda and Roshel had at first is the same.
25 u + 30 = 15 u + 90
25 u - 15 u = 90 - 30
10 u = 60
1 u = 60 ÷ 10 = 6
Amount that Hilda had at first
= 15 u + 90
= 15 x 6 + 90
= 90 + 90
= $180
Total amount that both girls had at first
= 2 x 180
= $360
Answer(s): $360
