Last week, Eric had a total of 160 blue and pink staplers. Two weeks later, he sold
45 of all the blue staplers and bought another 20 pink staplers. Now he has the same number of blue and pink staplers. How many staplers does he have in the end?
| |
Blue |
Pink |
Total |
| Before |
5 u |
1 u - 20 |
6 u - 20 |
| Change |
- 4 u |
+ 20 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and pink staplers in the end |
1 |
1 |
|
Total number of staplers at first
= 5 u + 1 u - 20
= 6 u - 20
6 u - 20 = 160
6 u = 160 + 20
6 u = 180
1 u = 180 ÷ 6 = 30
Number of staplers that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 30
= 60
Answer(s): 60
