Last week, Valen had a total of 153 pink and yellow pens. Two weeks later, he sold
23 of all the pink pens and 17 yellow pens. Now he has the same number of pink and yellow pens. How many pens does he have in the end?
| |
Pink |
Yellow |
Total |
| Before |
3 u |
1 u + 17 |
4 u + 17 |
| Change |
- 2 u |
- 17 |
|
| After |
1 u |
1 u |
|
Comparing the pink
and yellow pens in the end |
1 |
1 |
|
Total number of pens at first
= 3 u + 1 u + 17
= 4 u + 17
4 u + 17 = 153
4 u = 153 - 17
4 u = 136
1 u = 136 ÷ 4 = 34
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 34
= 68
Answer(s): 68
