Irene and Diana had equal amount of money. Each day, Irene spent $6 and Diana spent $9. When Irene had $108 left, Diana had
13 as much money left as Irene. How much money did the two girls have at first?
|
Irene |
Diana |
Before |
6 u + 108 |
9 u + 36 |
Change |
- 6 u |
- 9 u |
After |
$108 |
$36 |
Amount that Diana had left
=
13 x 108
= $36
The amount that Irene and Diana had at first is the same.
9 u + 36 = 6 u + 108
9 u - 6 u = 108 - 36
3 u = 72
1 u = 72 ÷ 3 = 24
Amount that Irene had at first
= 6 u + 108
= 6 x 24 + 108
= 144 + 108
= $252
Total amount that both girls had at first
= 2 x 252
= $504
Answer(s): $504