Last week, Elijah had a total of 173 green and pink pens. Two weeks later, he sold
34 of all the green pens and bought another 2 pink pens. Now he has the same number of green and pink pens. How many pens does he have in the end?
| |
Green |
Pink |
Total |
| Before |
4 u |
1 u - 2 |
5 u - 2 |
| Change |
- 3 u |
+ 2 |
|
| After |
1 u |
1 u |
|
Comparing the green
and pink pens in the end |
1 |
1 |
|
Total number of pens at first
= 4 u + 1 u - 2
= 5 u - 2
5 u - 2 = 173
5 u = 173 + 2
5 u = 175
1 u = 175 ÷ 5 = 35
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 35
= 70
Answer(s): 70
