Harry saved $9 each day and Julie saved $
e more than Harry each day. After 3 weeks, they were still short of $32 to buy a stereo system.
- How much did the stereo system cost? Express your answer in terms of e.
- If e = $18, how much did the stereo system cost?
(a)
Amount Harry saved per day = $9
Amount Julie saved per day = $(9 +
e)
Total amount both saved per day
= 9 + 9 +
e = $(18 +
e)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(18 +
e)
= 21 x 18 + 21 x
e = $(378 + 21
e)
Cost of the stereo system
= 378 + 21
e + 32
= 378 + 32 + 21
e= $(410 + 21
e)
(b)
If
e = $18,
Cost of the stereo system
= 410 + 21 x 18
= 410 + 378
= $788
Answer(s): (a) $(410 + 21
e) or $(21
e + 410); (b) $788
