A pen cost $1.50. A file cost $13.50 more than the pen. Cathy spent $168 on such pens and files. She bought four times as many pens as files.
- How many files did Cathy buy?
- How much money did Cathy spend on the pens?
|
Pens |
Files |
Total |
Number |
4 u |
1 u |
|
Value |
1.50 |
15 |
|
Total value |
6 u |
15 u |
168 |
(a)
Cost of a file
= 13.50 + 1.50
= $15
Total cost of pens and files
= 6 u + 15 u
= 21 u
21 u = 168
1 u = 168 ÷ 21 = 8
Number of files that Cathy bought
= 1 u
= 8
(b)
Amount that Cathy spent on pens
= 6 u
= 6 x 8
= $48
Answer(s): (a) 8; (b) $48