In a bookstore, the number of files was
511 of the total number of files and staplers together. Tommy sold the files and staplers in sets of 1 file and 4 staplers. After selling all the staplers, he still had 77 files left. How many staplers were in the bookstore at first?
|
Files |
Staplers |
Before |
5x2 = 10 u |
6x2 = 12 u |
Change |
- 1x3 = - 3 u |
- 4x3 = - 12 u |
After |
77 |
0 |
Since all the staplers were sold, the number of staplers at first and the number of staplers sold were the same. Make the number of staplers at first and sold the same. LCM of 6 and 4 is 12.
Number of files sold
= 10 u - 3 u
= 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Number of staplers at first
= 12 u
= 12 x 11
= 132
Answer(s): 132