Yoko spent
25 of her money on 3 punchers and 9 files. The cost of one file was thrice the cost of one puncher. She bought some more files with
15 of her remaining money. How many files did Yoko buy altogether?
3 punchers and
9 files |
Remaining amount |
| 2x5 |
3x5 |
| |
More files |
Left |
| |
1x3 |
4x3 |
| 10 p |
3 p |
12 p |
Cost of 1 puncher = 1 u
Cost of 1 file = 3 u
Cost of 3 punchers = 3 x 1 u = 3 u
Cost of 9 files = 9 x 3 u = 27 u
Total cost of 3 punchers and 9 files
= 3 u + 27 u
= 30 u
10 p = 30 u
1 p = 30 ÷ 10 = 3 u
Amount that Yoko used to buy more files
= 3 p
= 3 x 3 u
= 9 u
Number of more files that Yoko bought
= 9 u ÷ 3 u
= 3
Total number of files that Yoko bought
= 9 + 3
= 12
Answer(s): 12
