Gwen and Jaslyn had equal amount of money. Each day, Gwen spent $20 and Jaslyn spent $30. When Gwen had $80 left, Jaslyn had
78 as much money left as Gwen. How much money did the two girls have at first?
| |
Gwen |
Jaslyn |
| Before |
20 u + 80 |
30 u + 70 |
| Change |
- 20 u |
- 30 u |
| After |
$80 |
$70 |
Amount that Jaslyn had left
=
78 x 80
= $70
The amount that Gwen and Jaslyn had at first is the same.
30 u + 70 = 20 u + 80
30 u - 20 u = 80 - 70
10 u = 10
1 u = 10 ÷ 10 = 1
Amount that Gwen had at first
= 20 u + 80
= 20 x 1 + 80
= 20 + 80
= $100
Total amount that both girls had at first
= 2 x 100
= $200
Answer(s): $200
