Yen spent
37 of her money on 6 folders and 3 files. The cost of one file was four times the cost of one folder. She bought some more files with
16 of her remaining money. How many files did Yen buy altogether?
6 folders and
3 files |
Remaining amount |
| 3x3 |
4x3 |
| |
More files |
Left |
| |
1x2 |
5x2 |
| 9 p |
2 p |
10 p |
Cost of 1 folder = 1 u
Cost of 1 file = 4 u
Cost of 6 folders = 6 x 1 u = 6 u
Cost of 3 files = 3 x 4 u = 12 u
Total cost of 6 folders and 3 files
= 6 u + 12 u
= 18 u
9 p = 18 u
1 p = 18 ÷ 9 = 2 u
Amount that Yen used to buy more files
= 2 p
= 2 x 2 u
= 4 u
Number of more files that Yen bought
= 4 u ÷ 4 u
= 1
Total number of files that Yen bought
= 3 + 1
= 4
Answer(s): 4
