A pencil cost $1.50. A pen cost $14.50 more than the pencil. Betty spent $114 on such pencils and pens. She bought twice as many pencils as pens.
- How many pens did Betty buy?
- How much money did Betty spend on the pencils?
|
Pencils |
Pens |
Total |
Number |
2 u |
1 u |
|
Value |
1.50 |
16 |
|
Total value |
3 u |
16 u |
114 |
(a)
Cost of a pen
= 14.50 + 1.50
= $16
Total cost of pencils and pens
= 3 u + 16 u
= 19 u
19 u = 114
1 u = 114 ÷ 19 = 6
Number of pens that Betty bought
= 1 u
= 6
(b)
Amount that Betty spent on pencils
= 3 u
= 3 x 6
= $18
Answer(s): (a) 6; (b) $18