Last week, Zeph had a total of 86 grey and gold staplers. Two weeks later, he sold
34 of all the grey staplers and 21 gold staplers. Now he has the same number of grey and gold staplers. How many staplers does he have in the end?
| |
Grey |
Gold |
Total |
| Before |
4 u |
1 u + 21 |
5 u + 21 |
| Change |
- 3 u |
- 21 |
|
| After |
1 u |
1 u |
|
Comparing the grey
and gold staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 4 u + 1 u + 21
= 5 u + 21
5 u + 21 = 86
5 u = 86 - 21
5 u = 65
1 u = 65 ÷ 5 = 13
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 13
= 26
Answer(s): 26
