Rael saved $8 each day and Jane saved $
a more than Rael 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 a.
- If a = $13, how much did the laptop cost?
(a)
Amount Rael saved per day = $8
Amount Jane saved per day = $(8 +
a)
Total amount both saved per day
= 8 + 8 +
a = $(16 +
a)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(16 +
a)
= 21 x 16 + 21 x
a = $(336 + 21
a)
Cost of the laptop
= 336 + 21
a + 31
= 336 + 31 + 21
a= $(367 + 21
a)
(b)
If
a = $13,
Cost of the laptop
= 367 + 21 x 13
= 367 + 273
= $640
Answer(s): (a) $(367 + 21
a) or $(21
a + 367); (b) $640
