Last week, Ahmad had a total of 73 gold and black staplers. Two weeks later, he sold
45 of all the gold staplers and bought another 17 black staplers. Now he has the same number of gold and black staplers. How many staplers does he have in the end?
| |
Gold |
Black |
Total |
| Before |
5 u |
1 u - 17 |
6 u - 17 |
| Change |
- 4 u |
+ 17 |
|
| After |
1 u |
1 u |
|
Comparing the gold
and black staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 5 u + 1 u - 17
= 6 u - 17
6 u - 17 = 73
6 u = 73 + 17
6 u = 90
1 u = 90 ÷ 6 = 15
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 15
= 30
Answer(s): 30
