Anna had $30 more than Irene at first. After Anna and Irene spent an equal amount of money, Irene had
710 as much as Anna. How much money did Anna have left?
| |
Anna |
Irene |
Difference |
| Before |
1 u + $30 |
1 u |
$30 |
| Change |
- 1 |
- 1 |
|
| After |
10 p |
7 p |
3 p |
Difference in the amounts between Anna and Irene
= 10 p - 7 p
= 3 p
Since both Anna and Irene spent an equal amount, the difference in the amounts that Anna and Irene had at first and in the end remains unchanged.
3 p = 30
1 p = 30 ÷ 3 = 10
Amount that Anna had left
= 10 p
= 10 x 10
= $100
Answer(s): $100
