In a book shop, the number of folders was
23 of the total number of folders and pens together. Zane sold the folders and pens in sets of 4 folders and 10 pens. After selling all the pens, he still had 32 folders left. How many folders were in the book shop at first?
| |
Folders |
Pens |
| Before |
2x10 =
20 u |
1x10 =
10 u |
| Change |
- 4x1 =
- 4 u |
- 10x1 =
- 10 u |
| After |
32 |
0 |
Since all the pens were sold, the number of pens at first and the number of pens sold were the same. Make the number of pens at first and sold the same. LCM of 1 and 10 is 10.
Number of folders sold
= 20 u - 4 u
= 16 u
16 u = 32
1 u = 32 ÷ 16 = 2
Number of folders at first
= 20 u
= 20 x 2
= 40
Answer(s): 40
