Risa and Ivory had equal amount of money. Each day, Risa spent $6 and Ivory spent $14. When Risa had $90 left, Ivory had
15 as much money left as Risa. How much money did the two girls have at first?
| |
Risa |
Ivory |
| Before |
6 u + 90 |
14 u + 18 |
| Change |
- 6 u |
- 14 u |
| After |
$90 |
$18 |
Amount that Ivory had left
=
15 x 90
= $18
The amount that Risa and Ivory had at first is the same.
14 u + 18 = 6 u + 90
14 u - 6 u = 90 - 18
8 u = 72
1 u = 72 ÷ 8 = 9
Amount that Risa had at first
= 6 u + 90
= 6 x 9 + 90
= 54 + 90
= $144
Total amount that both girls had at first
= 2 x 144
= $288
Answer(s): $288
