Last week, Glen had a total of 307 blue and white pens. Two weeks later, he sold
56 of all the blue pens and 20 white pens. Now he has the same number of blue and white pens. How many pens does he have in the end?
| |
Blue |
White |
Total |
| Before |
6 u |
1 u + 20 |
7 u + 20 |
| Change |
- 5 u |
- 20 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and white pens in the end |
1 |
1 |
|
Total number of pens at first
= 6 u + 1 u + 20
= 7 u + 20
7 u + 20 = 307
7 u = 307 - 20
7 u = 287
1 u = 287 ÷ 7 = 41
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 41
= 82
Answer(s): 82
