Mark and Ben had $809. Mark spent
35 of his money on a notebook. Ben spent
14 of his money on a laptop. The notebook cost $159 more than the laptop. How much money had Mark left?
| |
Mark |
Ben |
Total |
Before |
5 u |
+ 265 |
4x3 =
12 u |
809 |
Change |
- 3 u |
- 159 |
- 1x3 =
- 3 u |
|
Comparing the notebook
and the laptop |
159 more |
|
|
After |
2 u |
+ 106 |
3x3 =
9 u |
|
159 ÷ 3 = 53
2 x 53 = 106
5 x 53 = 265
Total amount that Mark and Ben had at first
= 5 u + 265 + 12 u
= 17 u + 265
17 u + 265 = 809
17 u = 809 - 265
17 u = 544
1 u = 544 ÷ 17 = 32
Amount that Mark had left
= 2 u + 106
= 2 x 32 + 106
= 64 + 106
= $170
Answer(s): $170
