Simon and Tommy had $1070. Simon spent
59 of his money on a notebook. Tommy spent
14 of his money on a computer. The notebook cost $240 more than the computer. How much money had Simon left?
|
Simon |
Tommy |
Total |
Before |
9 u |
+ 432 |
4x5 = 20 u |
1070 |
Change |
- 5 u |
- 240 |
- 1x5 = - 5 u |
|
Comparing the notebook and the computer |
240 more |
|
|
After |
4 u |
+ 192 |
3x5 = 15 u |
|
240 ÷ 5 = 48
4 x 48 = 192
9 x 48 = 432
Total amount that Simon and Tommy had at first
= 9 u + 432 + 20 u
= 29 u + 432
29 u + 432 = 1070
29 u = 1070 - 432
29 u = 638
1 u = 638 ÷ 29 = 22
Amount that Simon had left
= 4 u + 192
= 4 x 22 + 192
= 88 + 192
= $280
Answer(s): $280