A notebook cost $2.50. A file cost $15.50 more than the notebook. Anna spent $336 on such notebooks and files. She bought four times as many notebooks as files.
- How many files did Anna buy?
- How much money did Anna spend on the notebooks?
|
Notebooks |
Files |
Total |
Number |
4 u |
1 u |
|
Value |
2.50 |
18 |
|
Total value |
10 u |
18 u |
336 |
(a)
Cost of a file
= 15.50 + 2.50
= $18
Total cost of notebooks and files
= 10 u + 18 u
= 28 u
28 u = 336
1 u = 336 ÷ 28 = 12
Number of files that Anna bought
= 1 u
= 12
(b)
Amount that Anna spent on notebooks
= 10 u
= 10 x 12
= $120
Answer(s): (a) 12; (b) $120