Xavier and Ben had $1416. Xavier spent
38 of his money on a portable air-conditioner. Ben spent
18 of his money on a laptop. The portable air-conditioner cost $243 more than the laptop. How much money had Xavier left?
| |
Xavier |
Ben |
Total |
Before |
8 u |
+ 648 |
8x3 =
24 u |
1416 |
Change |
- 3 u |
- 243 |
- 1x3 =
- 3 u |
|
Comparing the portable air-conditioner
and the laptop |
243 more |
|
|
After |
5 u |
+ 405 |
7x3 =
21 u |
|
243 ÷ 3 = 81
5 x 81 = 405
8 x 81 = 648
Total amount that Xavier and Ben had at first
= 8 u + 648 + 24 u
= 32 u + 648
32 u + 648 = 1416
32 u = 1416 - 648
32 u = 768
1 u = 768 ÷ 32 = 24
Amount that Xavier had left
= 5 u + 405
= 5 x 24 + 405
= 120 + 405
= $525
Answer(s): $525
