Zeph saved $9 each day and Diana saved $
w more than Zeph each day. After 5 weeks, they were still short of $28 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of w.
- If w = $16, how much did the laptop cost?
(a)
Amount Zeph saved per day = $9
Amount Diana saved per day = $(9 +
w)
Total amount both saved per day
= 9 + 9 +
w = $(18 +
w)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(18 +
w)
= 35 x 18 + 35 x
w = $(630 + 35
w)
Cost of the laptop
= 630 + 35
w + 28
= 630 + 28 + 35
w= $(658 + 35
w)
(b)
If
w = $16,
Cost of the laptop
= 658 + 35 x 16
= 658 + 560
= $1218
Answer(s): (a) $(658 + 35
w) or $(35
w + 658); (b) $1218
