Jen and Barbara had equal amount of money. Each day, Jen spent $12 and Barbara spent $21. When Jen had $90 left, Barbara had
25 as much money left as Jen. How much money did the two girls have at first?
| |
Jen |
Barbara |
| Before |
12 u + 90 |
21 u + 36 |
| Change |
- 12 u |
- 21 u |
| After |
$90 |
$36 |
Amount that Barbara had left
=
25 x 90
= $36
The amount that Jen and Barbara had at first is the same.
21 u + 36 = 12 u + 90
21 u - 12 u = 90 - 36
9 u = 54
1 u = 54 ÷ 9 = 6
Amount that Jen had at first
= 12 u + 90
= 12 x 6 + 90
= 72 + 90
= $162
Total amount that both girls had at first
= 2 x 162
= $324
Answer(s): $324
