Liam saved $8 each day and Jade saved $
b more than Liam each day. After 3 weeks, they were still short of $32 to buy a hard drive.
- How much did the hard drive cost? Express your answer in terms of b.
- If b = $15, how much did the hard drive cost?
(a)
Amount Liam saved per day = $8
Amount Jade saved per day = $(8 +
b)
Total amount both saved per day
= 8 + 8 +
b = $(16 +
b)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(16 +
b)
= 21 x 16 + 21 x
b = $(336 + 21
b)
Cost of the hard drive
= 336 + 21
b + 32
= 336 + 32 + 21
b= $(368 + 21
b)
(b)
If
b = $15,
Cost of the hard drive
= 368 + 21 x 15
= 368 + 315
= $683
Answer(s): (a) $(368 + 21
b) or $(21
b + 368); (b) $683
