In a bookstore, the number of pens was
23 of the total number of pens and glues together. Rael sold the pens and glues in sets of 3 pens and 3 glues. After selling all the glues, he still had 24 pens left. How many pens were in the bookstore at first?
|
Pens |
Glues |
Before |
2x3 = 6 u |
1x3 = 3 u |
Change |
- 3x1 = - 3 u |
- 3x1 = - 3 u |
After |
24 |
0 |
Since all the glues were sold, the number of glues at first and the number of glues sold were the same. Make the number of glues at first and sold the same. LCM of 1 and 3 is 3.
Number of pens sold
= 6 u - 3 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Number of pens at first
= 6 u
= 6 x 8
= 48
Answer(s): 48