Emily spent
34 of her money on 15 files and 7 notebooks. The cost of each notebook is 3 times the cost of each file. She bought some more files with
23 of her remaining money. How many files did Emily buy altogether?
| 15 files + 7 notebooks |
Remaining
amount |
Total
amount |
| 3 p = 36 u |
1 p = 12 u |
4 p |
15
files |
7
notebooks |
More files |
Left |
|
| |
|
2 |
1 |
|
| 15 u |
21 u |
8 u |
|
|
Cost of 1 file = 1 u
Cost of 1 notebook = 3 u
Cost of 15 files = 15 x 1 u = 15 u
Cost of 7 notebooks = 7 x 3 u = 21 u
Cost of 15 files + 7 notebooks
= 15 u + 21 u
= 36 u
3 p = 36 u
1 p = 36 u ÷ 3 = 12 u
Amount of remaining money that Emily spent on buying more files
=
23 x 12 u
= 8 u
Number of files that Emily bought with
23 of her remaining money
= 8 u ÷ 1 u
= 8
Total number of files that Emily bought
= 15 + 8
= 23
Answer(s): 23
