One pen costs $
d. One marker costs $(
d + 15). One guide book costs $4
d.
- Tom bought 4 pens, 3 markers and 1 guide book. How much did he spend? Simplify your answer in terms of d.
- If d = 9, how much did Tom spend altogether?
(a)
Cost of 4 pens = 4 x
d = $4
d Cost of 3 markers = 3 x (
d + 15) = $(3
d + 45)
Cost of 1 guide book = $4
d Total amount that he spent
= 4
d + 3
d + 45 + 4
d= 4
d + 3
d + 4
d + 45
= $(11
d + 45)
(b)
If
d = 9,
total amount that he spent
= 11
d + 45
= (11 x 9) + 45
= 99 + 45
= $144
Answer(s): (a) $(11
d + 45) or $(45 + 11
d); (b) $144