Mrs Peter paid a total of $39 for 2
n files and 4 notebooks. Each file cost $3.
- Express the cost of 1 notebook in terms of n.
- If n = 4, how much did each notebook cost?
(a)
Total amount spent on 2
n files
= 2
n x 3
= $6
n Total amount spent on 4 notebooks = $(39 - 6
n)
Total amount spent on 1 notebook = $(
39 - 6n4)
(b)
Price of each notebook if
n = 4
= (39 - 6 x 4) ÷ 4
= (39 - 24) ÷ 4
= 15 ÷ 4
= $3.75
Answer(s): (a) $(
39 - 6n4) or $
39 - 6n4; (b) $3.75