One pen costs $
j. One stapler costs $(
j + 15). One guide book costs $3
j.
- Luis bought 4 pens, 3 staplers and 1 guide book. How much did he spend? Simplify your answer in terms of j.
- If j = 6, how much did Luis spend altogether?
(a)
Cost of 4 pens = 4 x
j = $4
j Cost of 3 staplers = 3 x (
j + 15) = $(3
j + 45)
Cost of 1 guide book = $3
j Total amount that he spent
= 4
j + 3
j + 45 + 3
j= 4
j + 3
j + 3
j + 45
= $(10
j + 45)
(b)
If
j = 6,
total amount that he spent
= 10
j + 45
= (10 x 6) + 45
= 60 + 45
= $105
Answer(s): (a) $(10
j + 45) or $(45 + 10
j); (b) $105