In a shop, the number of pencils was
911 of the total number of pencils and notebooks together. Xavier sold the pencils and notebooks in sets of 1 pencil and 4 notebooks. After selling all the notebooks, he still had 68 pencils left. How many notebooks were in the shop at first?
| |
Pencils |
Notebooks |
| Before |
9x2 =
18 u |
2x2 =
4 u |
| Change |
- 1x1 =
- 1 u |
- 4x1 =
- 4 u |
| After |
68 |
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 2 and 4 is 4.
Number of pencils sold
= 18 u - 1 u
= 17 u
17 u = 68
1 u = 68 ÷ 17 = 4
Number of notebooks at first
= 4 u
= 4 x 4
= 16
Answer(s): 16
