In a store, the number of folders was
17 of the total number of folders and foolscaps together. David sold the folders and foolscaps in sets of 1 folder and 10 foolscaps. After selling all the foolscaps, he still had 10 folders left. How many foolscaps were in the store at first?
| |
Folders |
Foolscaps |
| Before |
1x5 =
5 u |
6x5 =
30 u |
| Change |
- 1x3 =
- 3 u |
- 10x3 =
- 30 u |
| After |
10 |
0 |
Since all the foolscaps were sold, the number of foolscaps at first and the number of foolscaps sold were the same. Make the number of foolscaps at first and sold the same. LCM of 6 and 10 is 30.
Number of folders sold
= 5 u - 3 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Number of foolscaps at first
= 30 u
= 30 x 5
= 150
Answer(s): 150
