Brandon saved $12 each day and Zara saved $
s more than Brandon each day. After 5 weeks, they were still short of $29 to buy a hi-fi system.
- How much did the hi-fi system cost? Express your answer in terms of s.
- If s = $3, how much did the hi-fi system cost?
(a)
Amount Brandon saved per day = $12
Amount Zara saved per day = $(12 +
s)
Total amount both saved per day
= 12 + 12 +
s = $(24 +
s)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(24 +
s)
= 35 x 24 + 35 x
s = $(840 + 35
s)
Cost of the hi-fi system
= 840 + 35
s + 29
= 840 + 29 + 35
s= $(869 + 35
s)
(b)
If
s = $3,
Cost of the hi-fi system
= 869 + 35 x 3
= 869 + 105
= $974
Answer(s): (a) $(869 + 35
s) or $(35
s + 869); (b) $974
