Last week, Archie had a total of 82 silver and grey pens. Two weeks later, he sold
23 of all the silver pens and 6 grey pens. Now he has the same number of silver and grey pens. How many pens does he have in the end?
| |
Silver |
Grey |
Total |
| Before |
3 u |
1 u + 6 |
4 u + 6 |
| Change |
- 2 u |
- 6 |
|
| After |
1 u |
1 u |
|
Comparing the silver
and grey pens in the end |
1 |
1 |
|
Total number of pens at first
= 3 u + 1 u + 6
= 4 u + 6
4 u + 6 = 82
4 u = 82 - 6
4 u = 76
1 u = 76 ÷ 4 = 19
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 19
= 38
Answer(s): 38
