Last week, George had a total of 160 black and grey staplers. Two weeks later, he sold
23 of all the black staplers and 4 grey staplers. Now he has the same number of black and grey staplers. How many staplers does he have in the end?
| |
Black |
Grey |
Total |
| Before |
3 u |
1 u + 4 |
4 u + 4 |
| Change |
- 2 u |
- 4 |
|
| After |
1 u |
1 u |
|
Comparing the black
and grey staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 3 u + 1 u + 4
= 4 u + 4
4 u + 4 = 160
4 u = 160 - 4
4 u = 156
1 u = 156 ÷ 4 = 39
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 39
= 78
Answer(s): 78
