John and Billy had $1280. John spent
35 of his money on a refrigerator. Billy spent
18 of his money on a laptop. The refrigerator cost $159 more than the laptop. How much money had John left?
| |
John |
Billy |
Total |
Before |
5 u |
+ 265 |
8x3 =
24 u |
1280 |
Change |
- 3 u |
- 159 |
- 1x3 =
- 3 u |
|
Comparing the refrigerator
and the laptop |
159 more |
|
|
After |
2 u |
+ 106 |
7x3 =
21 u |
|
159 ÷ 3 = 53
2 x 53 = 106
5 x 53 = 265
Total amount that John and Billy had at first
= 5 u + 265 + 24 u
= 29 u + 265
29 u + 265 = 1280
29 u = 1280 - 265
29 u = 1015
1 u = 1015 ÷ 29 = 35
Amount that John had left
= 2 u + 106
= 2 x 35 + 106
= 70 + 106
= $176
Answer(s): $176
