A pen cost $1.50. A pencil cost $12.50 more than the pen. Tammy spent $68 on such pens and pencils. She bought twice as many pens as pencils.
- How many pencils did Tammy buy?
- How much money did Tammy spend on the pens?
|
Pens |
Pencils |
Total |
Number |
2 u |
1 u |
|
Value |
1.50 |
14 |
|
Total value |
3 u |
14 u |
68 |
(a)
Cost of a pencil
= 12.50 + 1.50
= $14
Total cost of pens and pencils
= 3 u + 14 u
= 17 u
17 u = 68
1 u = 68 ÷ 17 = 4
Number of pencils that Tammy bought
= 1 u
= 4
(b)
Amount that Tammy spent on pens
= 3 u
= 3 x 4
= $12
Answer(s): (a) 4; (b) $12