Emma spent
25 of her money on 5 staplers and 9 files. The cost of one file was thrice the cost of one stapler. She bought some more files with
14 of her remaining money. How many files did Emma buy altogether?
5 staplers and 9 files |
Remaining amount |
2x4 |
3x4 |
|
More files |
Left |
|
1x3 |
3x3 |
8 p |
3 p |
9 p |
Cost of 1 stapler = 1 u
Cost of 1 file = 3 u
Cost of 5 staplers = 5 x 1 u = 5 u
Cost of 9 files = 9 x 3 u = 27 u
Total cost of 5 staplers and 9 files
= 5 u + 27 u
= 32 u
8 p = 32 u
1 p = 32 ÷ 8 = 4 u
Amount that Emma used to buy more files
= 3 p
= 3 x 4 u
= 12 u
Number of more files that Emma bought
= 12 u ÷ 3 u
= 4
Total number of files that Emma bought
= 9 + 4
= 13
Answer(s): 13