One pen costs $
n. One pencil costs $(
n + 15). One story book costs $5
n.
- Ian bought 3 pens, 3 pencils and 1 story book. How much did he spend? Simplify your answer in terms of n.
- If n = 4, how much did Ian spend altogether?
(a)
Cost of 3 pens = 3 x
n = $3
n Cost of 3 pencils = 3 x (
n + 15) = $(3
n + 45)
Cost of 1 story book = $5
n Total amount that he spent
= 3
n + 3
n + 45 + 5
n= 3
n + 3
n + 5
n + 45
= $(11
n + 45)
(b)
If
n = 4,
total amount that he spent
= 11
n + 45
= (11 x 4) + 45
= 44 + 45
= $89
Answer(s): (a) $(11
n + 45) or $(45 + 11
n); (b) $89