Kimberly spent
25 of her money on 10 foolscaps and 5 files. The cost of one file was twice the cost of one foolscap. She bought some more files with
15 of her remaining money. How many files did Kimberly buy altogether?
10 foolscaps and
5 files |
Remaining amount |
| 2x5 |
3x5 |
| |
More files |
Left |
| |
1x3 |
4x3 |
| 10 p |
3 p |
12 p |
Cost of 1 foolscap = 1 u
Cost of 1 file = 2 u
Cost of 10 foolscaps = 10 x 1 u = 10 u
Cost of 5 files = 5 x 2 u = 10 u
Total cost of 10 foolscaps and 5 files
= 10 u + 10 u
= 20 u
10 p = 20 u
1 p = 20 ÷ 10 = 2 u
Amount that Kimberly used to buy more files
= 3 p
= 3 x 2 u
= 6 u
Number of more files that Kimberly bought
= 6 u ÷ 2 u
= 3
Total number of files that Kimberly bought
= 5 + 3
= 8
Answer(s): 8
