Owen saved $11 each day and Kathy saved $
n more than Owen each day. After 3 weeks, they were still short of $28 to buy a laptop.
- How much did the laptop cost? Express your answer in terms of n.
- If n = $14, how much did the laptop cost?
(a)
Amount Owen saved per day = $11
Amount Kathy saved per day = $(11 +
n)
Total amount both saved per day
= 11 + 11 +
n = $(22 +
n)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(22 +
n)
= 21 x 22 + 21 x
n = $(462 + 21
n)
Cost of the laptop
= 462 + 21
n + 28
= 462 + 28 + 21
n= $(490 + 21
n)
(b)
If
n = $14,
Cost of the laptop
= 490 + 21 x 14
= 490 + 294
= $784
Answer(s): (a) $(490 + 21
n) or $(21
n + 490); (b) $784
