One pen costs $
k. One notebook costs $(
k + 15). One guide book costs $4
k.
- Henry bought 2 pens, 3 notebooks and 1 guide book. How much did he spend? Simplify your answer in terms of k.
- If k = 18, how much did Henry spend altogether?
(a)
Cost of 2 pens = 2 x
k = $2
k Cost of 3 notebooks = 3 x (
k + 15) = $(3
k + 45)
Cost of 1 guide book = $4
k Total amount that he spent
= 2
k + 3
k + 45 + 4
k= 2
k + 3
k + 4
k + 45
= $(9
k + 45)
(b)
If
k = 18,
total amount that he spent
= 9
k + 45
= (9 x 18) + 45
= 162 + 45
= $207
Answer(s): (a) $(9
k + 45) or $(45 + 9
k); (b) $207