Last week, Owen had a total of 22 blue and brown pens. Two weeks later, he sold
34 of all the blue pens and bought another 28 brown pens. Now he has the same number of blue and brown pens. How many pens does he have in the end?
| |
Blue |
Brown |
Total |
| Before |
4 u |
1 u - 28 |
5 u - 28 |
| Change |
- 3 u |
+ 28 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and brown pens in the end |
1 |
1 |
|
Total number of pens at first
= 4 u + 1 u - 28
= 5 u - 28
5 u - 28 = 22
5 u = 22 + 28
5 u = 50
1 u = 50 ÷ 5 = 10
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 10
= 20
Answer(s): 20
