In a stationery kiosk, the number of staplers was
23 of the total number of staplers and files together. Zane sold the staplers and files in sets of 4 staplers and 7 files. After selling all the files, he still had 120 staplers left. How many files were in the stationery kiosk were sold?
| |
Staplers |
Files |
| Before |
2x7 =
14 u |
1x7 =
7 u |
| Change |
- 4x1 =
- 4 u |
- 7x1 =
- 7 u |
| After |
120 |
0 |
Since all the files were sold, the number of files at first and the number of files sold were the same. Make the number of files at first and sold the same. LCM of 1 and 7 is 7.
Number of staplers sold
= 14 u - 4 u
= 10 u
10 u = 120
1 u = 120 ÷ 10 = 12
Number of files were sold
= 7 u
= 7 x 12
= 84
Answer(s): 84
