Yen spent
25 of her money on 10 markers and 2 files. The cost of one file was thrice the cost of one marker. She bought some more files with
14 of her remaining money. How many files did Yen buy altogether?
10 markers and
2 files |
Remaining amount |
| 2x4 |
3x4 |
| |
More files |
Left |
| |
1x3 |
3x3 |
| 8 p |
3 p |
9 p |
Cost of 1 marker = 1 u
Cost of 1 file = 3 u
Cost of 10 markers = 10 x 1 u = 10 u
Cost of 2 files = 2 x 3 u = 6 u
Total cost of 10 markers and 2 files
= 10 u + 6 u
= 16 u
8 p = 16 u
1 p = 16 ÷ 8 = 2 u
Amount that Yen used to buy more files
= 3 p
= 3 x 2 u
= 6 u
Number of more files that Yen bought
= 6 u ÷ 3 u
= 2
Total number of files that Yen bought
= 2 + 2
= 4
Answer(s): 4
