Last week, Glen had a total of 240 gold and grey staplers. Two weeks later, he sold
45 of all the gold staplers and bought another 30 grey staplers. Now he has the same number of gold and grey staplers. How many staplers does he have in the end?
| |
Gold |
Grey |
Total |
| Before |
5 u |
1 u - 30 |
6 u - 30 |
| Change |
- 4 u |
+ 30 |
|
| After |
1 u |
1 u |
|
Comparing the gold
and grey staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 5 u + 1 u - 30
= 6 u - 30
6 u - 30 = 240
6 u = 240 + 30
6 u = 270
1 u = 270 ÷ 6 = 45
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 45
= 90
Answer(s): 90
