Valen saved $11 each day and Vanessa saved $
r more than Valen each day. After 3 weeks, they were still short of $29 to buy a hard drive.
- How much did the hard drive cost? Express your answer in terms of r.
- If r = $13, how much did the hard drive cost?
(a)
Amount Valen saved per day = $11
Amount Vanessa saved per day = $(11 +
r)
Total amount both saved per day
= 11 + 11 +
r = $(22 +
r)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(22 +
r)
= 21 x 22 + 21 x
r = $(462 + 21
r)
Cost of the hard drive
= 462 + 21
r + 29
= 462 + 29 + 21
r= $(491 + 21
r)
(b)
If
r = $13,
Cost of the hard drive
= 491 + 21 x 13
= 491 + 273
= $764
Answer(s): (a) $(491 + 21
r) or $(21
r + 491); (b) $764
