Fabian saved $11 each day and Jen saved $
k more than Fabian each day. After 4 weeks, they were still short of $32 to buy a mobile phone.
- How much did the mobile phone cost? Express your answer in terms of k.
- If k = $19, how much did the mobile phone cost?
(a)
Amount Fabian saved per day = $11
Amount Jen saved per day = $(11 +
k)
Total amount both saved per day
= 11 + 11 +
k = $(22 +
k)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(22 +
k)
= 28 x 22 + 28 x
k = $(616 + 28
k)
Cost of the mobile phone
= 616 + 28
k + 32
= 616 + 32 + 28
k= $(648 + 28
k)
(b)
If
k = $19,
Cost of the mobile phone
= 648 + 28 x 19
= 648 + 532
= $1180
Answer(s): (a) $(648 + 28
k) or $(28
k + 648); (b) $1180
