Sarah and Jen had equal amount of money. Each day, Sarah spent $12 and Jen spent $15. When Sarah had $81 left, Jen had
79 as much money left as Sarah. How much money did the two girls have at first?
| |
Sarah |
Jen |
| Before |
12 u + 81 |
15 u + 63 |
| Change |
- 12 u |
- 15 u |
| After |
$81 |
$63 |
Amount that Jen had left
=
79 x 81
= $63
The amount that Sarah and Jen had at first is the same.
15 u + 63 = 12 u + 81
15 u - 12 u = 81 - 63
3 u = 18
1 u = 18 ÷ 3 = 6
Amount that Sarah had at first
= 12 u + 81
= 12 x 6 + 81
= 72 + 81
= $153
Total amount that both girls had at first
= 2 x 153
= $306
Answer(s): $306
