Luis and John had $555 altogether. After Luis spent
15 of his money and John spent
45 of his money, Luis was left with twice as much money as John. How much money did John have at first?
| |
Luis |
John |
Total |
| Before |
5x1 =
5 u |
5x2 =
10 u |
$555 |
| Change |
- 1x1 =
- 1 u |
- 4x2 =
- 8 u |
|
| After |
4x1 =
4 u |
1x2 =
2 u |
|
Comparing Luis
and John in the end |
2x2 =
4 u |
1x2 =
2 u |
|
The amount that Luis had in the end is repeated. Make the amount that Luis had in the end the same. LCM of 4 and 2 is 4.
Total amount that Luis and John had at first
= 5 u + 10 u
= 15 u
15 u = 555
1 u = 555 ÷ 15 = 37
Amount that John had at first
= 10 u
= 10 x 37
= $370
Answer(s): $370
