Billy saved $12 each day and Jaslyn saved $
m more than Billy each day. After 2 weeks, they were still short of $31 to buy a hi-fi system.
- How much did the hi-fi system cost? Express your answer in terms of m.
- If m = $15, how much did the hi-fi system cost?
(a)
Amount Billy saved per day = $12
Amount Jaslyn saved per day = $(12 +
m)
Total amount both saved per day
= 12 + 12 +
m = $(24 +
m)
Number of days in 2 weeks
= 2 x 7
= 14
Total both saved in 2 weeks
= 14(24 +
m)
= 14 x 24 + 14 x
m = $(336 + 14
m)
Cost of the hi-fi system
= 336 + 14
m + 31
= 336 + 31 + 14
m= $(367 + 14
m)
(b)
If
m = $15,
Cost of the hi-fi system
= 367 + 14 x 15
= 367 + 210
= $577
Answer(s): (a) $(367 + 14
m) or $(14
m + 367); (b) $577
