Ethan had $120 more than John. After John gave $138 to Ethan, Ethan had 4 times as much money as John. How much money did Ethan have at first?
| |
Ethan |
John |
Comparing between
Ethan and John
at first |
$120 more |
|
| Before |
4 u - $138 |
1 u + $138 |
| Change |
+ $138 |
- $138 |
| After |
4 u |
1 u |
Ethan had $120 more than John at first. If John had another $120 at first, both of them would had the same amount of money.
4 u - 138 = 1 u + 138 + 120
4 u - 138 = 1 u + 258
4 u - 1 u = 138 + 258
3 u = 396
1 u = 396 ÷ 3 = 132
Amount that Ethan had at first
= 4 u - 138
= 4 x 132 - 138
= 528 - 138
= $390
Answer(s): $390
