Last week, Warren had a total of 90 grey and pink staplers. Two weeks later, he sold
23 of all the grey staplers and bought another 22 pink staplers. Now he has the same number of grey and pink staplers. How many staplers does he have in the end?
| |
Grey |
Pink |
Total |
| Before |
3 u |
1 u - 22 |
4 u - 22 |
| Change |
- 2 u |
+ 22 |
|
| After |
1 u |
1 u |
|
Comparing the grey
and pink staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 3 u + 1 u - 22
= 4 u - 22
4 u - 22 = 90
4 u = 90 + 22
4 u = 112
1 u = 112 ÷ 4 = 28
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 28
= 56
Answer(s): 56
