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