Last week, Tim had a total of 120 purple and blue pens. Two weeks later, he sold
56 of all the purple pens and 29 blue pens. Now he has the same number of purple and blue pens. How many pens does he have in the end?
|
Purple |
Blue |
Total |
Before |
6 u |
1 u + 29 |
7 u + 29 |
Change |
- 5 u |
- 29 |
|
After |
1 u |
1 u |
|
Comparing the purple and blue pens in the end |
1 |
1 |
|
Total number of pens at first
= 6 u + 1 u + 29
= 7 u + 29
7 u + 29 = 120
7 u = 120 - 29
7 u = 91
1 u = 91 ÷ 7 = 13
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 13
= 26
Answer(s): 26