In a bookstore, the number of punchers was
79 of the total number of punchers and folders together. Brandon sold the punchers and folders in sets of 4 punchers and 4 folders. After selling all the folders, he still had 20 punchers left. How many punchers were in the bookstore at first?
| |
Punchers |
Folders |
| Before |
7x2 =
14 u |
2x2 =
4 u |
| Change |
- 4x1 =
- 4 u |
- 4x1 =
- 4 u |
| After |
20 |
0 |
Since all the folders were sold, the number of folders at first and the number of folders sold were the same. Make the number of folders at first and sold the same. LCM of 2 and 4 is 4.
Number of punchers sold
= 14 u - 4 u
= 10 u
10 u = 20
1 u = 20 ÷ 10 = 2
Number of punchers at first
= 14 u
= 14 x 2
= 28
Answer(s): 28
