Pamela and Betty had equal amount of money. Each day, Pamela spent $17 and Betty spent $21. When Pamela had $120 left, Betty had
13 as much money left as Pamela. How much money did the two girls have at first?
| |
Pamela |
Betty |
| Before |
17 u + 120 |
21 u + 40 |
| Change |
- 17 u |
- 21 u |
| After |
$120 |
$40 |
Amount that Betty had left
=
13 x 120
= $40
The amount that Pamela and Betty had at first is the same.
21 u + 40 = 17 u + 120
21 u - 17 u = 120 - 40
4 u = 80
1 u = 80 ÷ 4 = 20
Amount that Pamela had at first
= 17 u + 120
= 17 x 20 + 120
= 340 + 120
= $460
Total amount that both girls had at first
= 2 x 460
= $920
Answer(s): $920
