In a store, the number of folders was
14 of the total number of folders and notebooks together. Glen sold the folders and notebooks in sets of 1 folder and 7 notebooks. After selling all the notebooks, he still had 8 folders left. How many notebooks were in the store at first?
| |
Folders |
Notebooks |
| Before |
1x7 =
7 u |
3x7 =
21 u |
| Change |
- 1x3 =
- 3 u |
- 7x3 =
- 21 u |
| After |
8 |
0 |
Since all the notebooks were sold, the number of notebooks at first and the number of notebooks sold were the same. Make the number of notebooks at first and sold the same. LCM of 3 and 7 is 21.
Number of folders sold
= 7 u - 3 u
= 4 u
4 u = 8
1 u = 8 ÷ 4 = 2
Number of notebooks at first
= 21 u
= 21 x 2
= 42
Answer(s): 42
