Last week, Owen had a total of 256 yellow and black staplers. Two weeks later, he sold
56 of all the yellow staplers and 4 black staplers. Now he has the same number of yellow and black staplers. How many staplers does he have in the end?
| |
Yellow |
Black |
Total |
| Before |
6 u |
1 u + 4 |
7 u + 4 |
| Change |
- 5 u |
- 4 |
|
| After |
1 u |
1 u |
|
Comparing the yellow
and black staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 6 u + 1 u + 4
= 7 u + 4
7 u + 4 = 256
7 u = 256 - 4
7 u = 252
1 u = 252 ÷ 7 = 36
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 36
= 72
Answer(s): 72
