Ryan saved $9 each day and Sabrina saved $
g more than Ryan each day. After 4 weeks, they were still short of $28 to buy a hi-fi system.
- How much did the hi-fi system cost? Express your answer in terms of g.
- If g = $12, how much did the hi-fi system cost?
(a)
Amount Ryan saved per day = $9
Amount Sabrina saved per day = $(9 +
g)
Total amount both saved per day
= 9 + 9 +
g = $(18 +
g)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(18 +
g)
= 28 x 18 + 28 x
g = $(504 + 28
g)
Cost of the hi-fi system
= 504 + 28
g + 28
= 504 + 28 + 28
g= $(532 + 28
g)
(b)
If
g = $12,
Cost of the hi-fi system
= 532 + 28 x 12
= 532 + 336
= $868
Answer(s): (a) $(532 + 28
g) or $(28
g + 532); (b) $868
