Luis and Gabriel had $1438. Luis spent
49 of his money on a washing machine. Gabriel spent
18 of his money on a laptop. The washing machine cost $220 more than the laptop. How much money had Luis left?
|
Luis |
Gabriel |
Total |
Before |
9 u |
+ 495 |
8x4 = 32 u |
1438 |
Change |
- 4 u |
- 220 |
- 1x4 = - 4 u |
|
Comparing the washing machine and the laptop |
220 more |
|
|
After |
5 u |
+ 275 |
7x4 = 28 u |
|
220 ÷ 4 = 55
5 x 55 = 275
9 x 55 = 495
Total amount that Luis and Gabriel had at first
= 9 u + 495 + 32 u
= 41 u + 495
41 u + 495 = 1438
41 u = 1438 - 495
41 u = 943
1 u = 943 ÷ 41 = 23
Amount that Luis had left
= 5 u + 275
= 5 x 23 + 275
= 115 + 275
= $390
Answer(s): $390