Luis and Riordan had $1406. Luis spent
59 of his money on a laptop. Riordan spent
15 of his money on a washing machine. The laptop cost $120 more than the washing machine. How much money had Luis left?
| |
Luis |
Riordan |
Total |
Before |
9 u |
+ 216 |
5x5 =
25 u |
1406 |
Change |
- 5 u |
- 120 |
- 1x5 =
- 5 u |
|
Comparing the laptop
and the washing machine |
120 more |
|
|
After |
4 u |
+ 96 |
4x5 =
20 u |
|
120 ÷ 5 = 24
4 x 24 = 96
9 x 24 = 216
Total amount that Luis and Riordan had at first
= 9 u + 216 + 25 u
= 34 u + 216
34 u + 216 = 1406
34 u = 1406 - 216
34 u = 1190
1 u = 1190 ÷ 34 = 35
Amount that Luis had left
= 4 u + 96
= 4 x 35 + 96
= 140 + 96
= $236
Answer(s): $236
