One marble costs $
n. One notebook costs $(
n + 15). One guide book costs $5
n.
- Perry bought 5 marbles, 3 notebooks and 1 guide book. How much did he spend? Simplify your answer in terms of n.
- If n = 18, how much did Perry spend altogether?
(a)
Cost of 5 marbles = 5 x
n = $5
n Cost of 3 notebooks = 3 x (
n + 15) = $(3
n + 45)
Cost of 1 guide book = $5
n Total amount that he spent
= 5
n + 3
n + 45 + 5
n= 5
n + 3
n + 5
n + 45
= $(13
n + 45)
(b)
If
n = 18,
total amount that he spent
= 13
n + 45
= (13 x 18) + 45
= 234 + 45
= $279
Answer(s): (a) $(13
n + 45) or $(45 + 13
n); (b) $279