Caden saved $8 each day and Joelle saved $
z more than Caden each day. After 5 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 z.
- If z = $11, how much did the mobile phone cost?
(a)
Amount Caden saved per day = $8
Amount Joelle saved per day = $(8 +
z)
Total amount both saved per day
= 8 + 8 +
z = $(16 +
z)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(16 +
z)
= 35 x 16 + 35 x
z = $(560 + 35
z)
Cost of the mobile phone
= 560 + 35
z + 32
= 560 + 32 + 35
z= $(592 + 35
z)
(b)
If
z = $11,
Cost of the mobile phone
= 592 + 35 x 11
= 592 + 385
= $977
Answer(s): (a) $(592 + 35
z) or $(35
z + 592); (b) $977