A pen cost $2.50. A file cost $13.50 more than the pen. Opal spent $63 on such pens and files. She bought twice as many pens as files.
- How many files did Opal buy?
- How much money did Opal spend on the pens?
|
Pens |
Files |
Total |
Number |
2 u |
1 u |
|
Value |
2.50 |
16 |
|
Total value |
5 u |
16 u |
63 |
(a)
Cost of a file
= 13.50 + 2.50
= $16
Total cost of pens and files
= 5 u + 16 u
= 21 u
21 u = 63
1 u = 63 ÷ 21 = 3
Number of files that Opal bought
= 1 u
= 3
(b)
Amount that Opal spent on pens
= 5 u
= 5 x 3
= $15
Answer(s): (a) 3; (b) $15