Jeremy saved $10 each day and Fiona saved $
q more than Jeremy each day. After 4 weeks, they were still short of $28 to buy a mobile phone.
- How much did the mobile phone cost? Express your answer in terms of q.
- If q = $20, how much did the mobile phone cost?
(a)
Amount Jeremy saved per day = $10
Amount Fiona saved per day = $(10 +
q)
Total amount both saved per day
= 10 + 10 +
q = $(20 +
q)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(20 +
q)
= 28 x 20 + 28 x
q = $(560 + 28
q)
Cost of the mobile phone
= 560 + 28
q + 28
= 560 + 28 + 28
q= $(588 + 28
q)
(b)
If
q = $20,
Cost of the mobile phone
= 588 + 28 x 20
= 588 + 560
= $1148
Answer(s): (a) $(588 + 28
q) or $(28
q + 588); (b) $1148
