Lee saved $9 each day and Pamela saved $
k more than Lee each day. After 3 weeks, they were still short of $29 to buy a computer.
- How much did the computer cost? Express your answer in terms of k.
- If k = $7, how much did the computer cost?
(a)
Amount Lee saved per day = $9
Amount Pamela saved per day = $(9 +
k)
Total amount both saved per day
= 9 + 9 +
k = $(18 +
k)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(18 +
k)
= 21 x 18 + 21 x
k = $(378 + 21
k)
Cost of the computer
= 378 + 21
k + 29
= 378 + 29 + 21
k= $(407 + 21
k)
(b)
If
k = $7,
Cost of the computer
= 407 + 21 x 7
= 407 + 147
= $554
Answer(s): (a) $(407 + 21
k) or $(21
k + 407); (b) $554
