A notebook cost $1.50. A pen cost $13.50 more than the notebook. Winnie spent $180 on such notebooks and pens. She bought twice as many notebooks as pens.
- How many pens did Winnie buy?
- How much money did Winnie spend on the notebooks?
|
Notebooks |
Pens |
Total |
Number |
2 u |
1 u |
|
Value |
1.50 |
15 |
|
Total value |
3 u |
15 u |
180 |
(a)
Cost of a pen
= 13.50 + 1.50
= $15
Total cost of notebooks and pens
= 3 u + 15 u
= 18 u
18 u = 180
1 u = 180 ÷ 18 = 10
Number of pens that Winnie bought
= 1 u
= 10
(b)
Amount that Winnie spent on notebooks
= 3 u
= 3 x 10
= $30
Answer(s): (a) 10; (b) $30