Bryan saved $9 each day and Hazel saved $
d more than Bryan each day. After 5 weeks, they were still short of $30 to buy a mobile phone.
- How much did the mobile phone cost? Express your answer in terms of d.
- If d = $9, how much did the mobile phone cost?
(a)
Amount Bryan saved per day = $9
Amount Hazel saved per day = $(9 +
d)
Total amount both saved per day
= 9 + 9 +
d = $(18 +
d)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(18 +
d)
= 35 x 18 + 35 x
d = $(630 + 35
d)
Cost of the mobile phone
= 630 + 35
d + 30
= 630 + 30 + 35
d= $(660 + 35
d)
(b)
If
d = $9,
Cost of the mobile phone
= 660 + 35 x 9
= 660 + 315
= $975
Answer(s): (a) $(660 + 35
d) or $(35
d + 660); (b) $975
