Joelle had $30 less than Mary at first. After Mary and Joelle spent an equal amount of money, Joelle had
47 as much as Mary. How much money did Joelle have left?
| |
Joelle |
Mary |
Difference |
| Before |
1 u |
1 u + $30 |
$30 |
| Change |
- 1 |
- 1 |
|
| After |
4 p |
7 p |
3 p |
Difference in the amounts between Mary and Joelle
= 7 p - 4 p
= 3 p
Since both Mary and Joelle spent an equal amount, the difference in the amounts that Mary and Joelle had at first and in the end remains unchanged.
3 p = 30
1 p = 30 ÷ 3 = 10
Amount that Joelle had left
= 4 p
= 4 x 10
= $40
Answer(s): $40
