Peter saved $8 each day and Shannon saved $
m more than Peter each day. After 3 weeks, they were still short of $30 to buy a stereo system.
- How much did the stereo system cost? Express your answer in terms of m.
- If m = $15, how much did the stereo system cost?
(a)
Amount Peter saved per day = $8
Amount Shannon saved per day = $(8 +
m)
Total amount both saved per day
= 8 + 8 +
m = $(16 +
m)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(16 +
m)
= 21 x 16 + 21 x
m = $(336 + 21
m)
Cost of the stereo system
= 336 + 21
m + 30
= 336 + 30 + 21
m= $(366 + 21
m)
(b)
If
m = $15,
Cost of the stereo system
= 366 + 21 x 15
= 366 + 315
= $681
Answer(s): (a) $(366 + 21
m) or $(21
m + 366); (b) $681
