Gillian and Ivory had equal amount of money. Each day, Gillian spent $7 and Ivory spent $17. When Gillian had $100 left, Ivory had
710 as much money left as Gillian. How much money did the two girls have at first?
| |
Gillian |
Ivory |
| Before |
7 u + 100 |
17 u + 70 |
| Change |
- 7 u |
- 17 u |
| After |
$100 |
$70 |
Amount that Ivory had left
=
710 x 100
= $70
The amount that Gillian and Ivory had at first is the same.
17 u + 70 = 7 u + 100
17 u - 7 u = 100 - 70
10 u = 30
1 u = 30 ÷ 10 = 3
Amount that Gillian had at first
= 7 u + 100
= 7 x 3 + 100
= 21 + 100
= $121
Total amount that both girls had at first
= 2 x 121
= $242
Answer(s): $242
