A pen cost $1.50. A notebook cost $13.50 more than the pen. Gem spent $72 on such pens and notebooks. She bought twice as many pens as notebooks.
- How many notebooks did Gem buy?
- How much money did Gem spend on the pens?
|
Pens |
Notebooks |
Total |
Number |
2 u |
1 u |
|
Value |
1.50 |
15 |
|
Total value |
3 u |
15 u |
72 |
(a)
Cost of a notebook
= 13.50 + 1.50
= $15
Total cost of pens and notebooks
= 3 u + 15 u
= 18 u
18 u = 72
1 u = 72 ÷ 18 = 4
Number of notebooks that Gem bought
= 1 u
= 4
(b)
Amount that Gem spent on pens
= 3 u
= 3 x 4
= $12
Answer(s): (a) 4; (b) $12