Eva spent
27 of her money on 10 foolscaps and 7 files. The cost of one file was twice the cost of one foolscap. She bought some more files with
16 of her remaining money. How many files did Eva buy altogether?
10 foolscaps and
7 files |
Remaining amount |
| 2x6 |
5x6 |
| |
More files |
Left |
| |
1x5 |
5x5 |
| 12 p |
5 p |
25 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 7 files = 7 x 2 u = 14 u
Total cost of 10 foolscaps and 7 files
= 10 u + 14 u
= 24 u
12 p = 24 u
1 p = 24 ÷ 12 = 2 u
Amount that Eva used to buy more files
= 5 p
= 5 x 2 u
= 10 u
Number of more files that Eva bought
= 10 u ÷ 2 u
= 5
Total number of files that Eva bought
= 7 + 5
= 12
Answer(s): 12
