A pen cost $3.50. A file cost $12.50 more than the pen. Gem spent $161 on such pens and files. She bought twice as many pens as files.
- How many files did Gem buy?
- How much money did Gem spend on the pens?
|
Pens |
Files |
Total |
Number |
2 u |
1 u |
|
Value |
3.50 |
16 |
|
Total value |
7 u |
16 u |
161 |
(a)
Cost of a file
= 12.50 + 3.50
= $16
Total cost of pens and files
= 7 u + 16 u
= 23 u
23 u = 161
1 u = 161 ÷ 23 = 7
Number of files that Gem bought
= 1 u
= 7
(b)
Amount that Gem spent on pens
= 7 u
= 7 x 7
= $49
Answer(s): (a) 7; (b) $49