A notebook cost $2.50. A file cost $12.50 more than the notebook. Sarah spent $275 on such notebooks and files. She bought four times as many notebooks as files.
- How many files did Sarah buy?
- How much money did Sarah spend on the notebooks?
|
Notebooks |
Files |
Total |
Number |
4 u |
1 u |
|
Value |
2.50 |
15 |
|
Total value |
10 u |
15 u |
275 |
(a)
Cost of a file
= 12.50 + 2.50
= $15
Total cost of notebooks and files
= 10 u + 15 u
= 25 u
25 u = 275
1 u = 275 ÷ 25 = 11
Number of files that Sarah bought
= 1 u
= 11
(b)
Amount that Sarah spent on notebooks
= 10 u
= 10 x 11
= $110
Answer(s): (a) 11; (b) $110