Archie saved $9 each day and Jaslyn saved $
t more than Archie each day. After 3 weeks, they were still short of $31 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of t.
- If t = $9, how much did the laptop cost?
(a)
Amount Archie saved per day = $9
Amount Jaslyn saved per day = $(9 +
t)
Total amount both saved per day
= 9 + 9 +
t = $(18 +
t)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(18 +
t)
= 21 x 18 + 21 x
t = $(378 + 21
t)
Cost of the laptop
= 378 + 21
t + 31
= 378 + 31 + 21
t= $(409 + 21
t)
(b)
If
t = $9,
Cost of the laptop
= 409 + 21 x 9
= 409 + 189
= $598
Answer(s): (a) $(409 + 21
t) or $(21
t + 409); (b) $598
