Nora spent
35 of her money on 3 glues and 6 files. The cost of one file was twice the cost of one glue. She bought some more files with
15 of her remaining money. How many files did Nora buy altogether?
3 glues and
6 files |
Remaining amount |
| 3x5 |
2x5 |
| |
More files |
Left |
| |
1x2 |
4x2 |
| 15 p |
2 p |
8 p |
Cost of 1 glue = 1 u
Cost of 1 file = 2 u
Cost of 3 glues = 3 x 1 u = 3 u
Cost of 6 files = 6 x 2 u = 12 u
Total cost of 3 glues and 6 files
= 3 u + 12 u
= 15 u
15 p = 15 u
1 p = 15 ÷ 15 = 1 u
Amount that Nora used to buy more files
= 2 p
= 2 x 1 u
= 2 u
Number of more files that Nora bought
= 2 u ÷ 2 u
= 1
Total number of files that Nora bought
= 6 + 1
= 7
Answer(s): 7
