A pencil cost $3.50. A file cost $14.50 more than the pencil. Eva spent $225 on such pencils and files. She bought twice as many pencils as files.
- How many files did Eva buy?
- How much money did Eva spend on the pencils?
|
Pencils |
Files |
Total |
Number |
2 u |
1 u |
|
Value |
3.50 |
18 |
|
Total value |
7 u |
18 u |
225 |
(a)
Cost of a file
= 14.50 + 3.50
= $18
Total cost of pencils and files
= 7 u + 18 u
= 25 u
25 u = 225
1 u = 225 ÷ 25 = 9
Number of files that Eva bought
= 1 u
= 9
(b)
Amount that Eva spent on pencils
= 7 u
= 7 x 9
= $63
Answer(s): (a) 9; (b) $63