Last week, Bryan had a total of 171 brown and red staplers. Two weeks later, he sold
23 of all the brown staplers and bought another 9 red staplers. Now he has the same number of brown and red staplers. How many staplers does he have in the end?
|
Brown |
Red |
Total |
Before |
3 u |
1 u - 9 |
4 u - 9 |
Change |
- 2 u |
+ 9 |
|
After |
1 u |
1 u |
|
Comparing the brown and red staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 3 u + 1 u - 9
= 4 u - 9
4 u - 9 = 171
4 u = 171 + 9
4 u = 180
1 u = 180 ÷ 4 = 45
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 45
= 90
Answer(s): 90