Eva had $21 less than Gwen at first. After Gwen and Eva spent an equal amount of money, Eva had
310 as much as Gwen. How much money did Eva have left?
|
Eva |
Gwen |
Difference |
Before |
1 u |
1 u + $21 |
$21 |
Change |
- 1 |
- 1 |
|
After |
3 p |
10 p |
7 p |
Difference in the amounts between Gwen and Eva
= 10 p - 3 p
= 7 p
Since both Gwen and Eva spent an equal amount, the difference in the amounts that Gwen and Eva had at first and in the end remains unchanged.
7 p = 21
1 p = 21 ÷ 7 = 3
Amount that Eva had left
= 3 p
= 3 x 3
= $9
Answer(s): $9