Seth and Ethan had a total of $189. Seth gave $10 to Ethan. In return, Ethan gave $31 to Seth. In the end, Seth had $31 more than Ethan. How much money did Seth have at first?
| |
Seth |
Ethan |
Total |
| Before |
? |
|
$189 |
| Change 1 |
- $10 |
+ $10 |
|
| Change 2 |
+ $31 |
- $31 |
|
| After |
1 u + $31 |
1 u |
$189 |
Total amount that Seth and Ethan had
= 1 u + 1 u + $31
= 2 u + 31
2 u + 31 = 189
2 u = 189 - 31
2 u = 158
1 u = 158 ÷ 2 = 79
Amount that Seth had in the end
= 1 u + 31
= 79 + 31
= $110
Amount that Seth had at first
= 110 - 31 + 10
= $89
Answer(s): $89
