Eva and Gwen had equal amount of money. Each day, Eva spent $7 and Gwen spent $15. When Eva had $80 left, Gwen had
15 as much money left as Eva. How much money did the two girls have at first?
| |
Eva |
Gwen |
| Before |
7 u + 80 |
15 u + 16 |
| Change |
- 7 u |
- 15 u |
| After |
$80 |
$16 |
Amount that Gwen had left
=
15 x 80
= $16
The amount that Eva and Gwen had at first is the same.
15 u + 16 = 7 u + 80
15 u - 7 u = 80 - 16
8 u = 64
1 u = 64 ÷ 8 = 8
Amount that Eva had at first
= 7 u + 80
= 7 x 8 + 80
= 56 + 80
= $136
Total amount that both girls had at first
= 2 x 136
= $272
Answer(s): $272
