Glen saved $9 each day and Dana saved $
d more than Glen each day. After 4 weeks, they were still short of $30 to buy a hard drive.
- How much did the hard drive cost? Express your answer in terms of d.
- If d = $9, how much did the hard drive cost?
(a)
Amount Glen saved per day = $9
Amount Dana saved per day = $(9 +
d)
Total amount both saved per day
= 9 + 9 +
d = $(18 +
d)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(18 +
d)
= 28 x 18 + 28 x
d = $(504 + 28
d)
Cost of the hard drive
= 504 + 28
d + 30
= 504 + 30 + 28
d= $(534 + 28
d)
(b)
If
d = $9,
Cost of the hard drive
= 534 + 28 x 9
= 534 + 252
= $786
Answer(s): (a) $(534 + 28
d) or $(28
d + 534); (b) $786
