Last week, Reggie had a total of 93 grey and silver pens. Two weeks later, he sold
45 of all the grey pens and 15 silver pens. Now he has the same number of grey and silver pens. How many pens does he have in the end?
| |
Grey |
Silver |
Total |
| Before |
5 u |
1 u + 15 |
6 u + 15 |
| Change |
- 4 u |
- 15 |
|
| After |
1 u |
1 u |
|
Comparing the grey
and silver pens in the end |
1 |
1 |
|
Total number of pens at first
= 5 u + 1 u + 15
= 6 u + 15
6 u + 15 = 93
6 u = 93 - 15
6 u = 78
1 u = 78 ÷ 6 = 13
Number of pens that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 13
= 26
Answer(s): 26
