Japheth saved $10 each day and Gem saved $
n more than Japheth each day. After 3 weeks, they were still short of $28 to buy a hard drive.
- How much did the hard drive cost? Express your answer in terms of n.
- If n = $7, how much did the hard drive cost?
(a)
Amount Japheth saved per day = $10
Amount Gem saved per day = $(10 +
n)
Total amount both saved per day
= 10 + 10 +
n = $(20 +
n)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(20 +
n)
= 21 x 20 + 21 x
n = $(420 + 21
n)
Cost of the hard drive
= 420 + 21
n + 28
= 420 + 28 + 21
n= $(448 + 21
n)
(b)
If
n = $7,
Cost of the hard drive
= 448 + 21 x 7
= 448 + 147
= $595
Answer(s): (a) $(448 + 21
n) or $(21
n + 448); (b) $595
