Irene had $77 more than Olivia at first. After Irene and Olivia spent an equal amount of money, Olivia had
310 as much as Irene. How much money did Irene have left?
|
Irene |
Olivia |
Difference |
Before |
1 u + $77 |
1 u |
$77 |
Change |
- 1 |
- 1 |
|
After |
10 p |
3 p |
7 p |
Difference in the amounts between Irene and Olivia
= 10 p - 3 p
= 7 p
Since both Irene and Olivia spent an equal amount, the difference in the amounts that Irene and Olivia had at first and in the end remains unchanged.
7 p = 77
1 p = 77 ÷ 7 = 11
Amount that Irene had left
= 10 p
= 10 x 11
= $110
Answer(s): $110