Ryan saved $12 each day and Jen saved $
r more than Ryan each day. After 3 weeks, they were still short of $28 to buy a tablet.
- How much did the tablet cost? Express your answer in terms of r.
- If r = $6, how much did the tablet cost?
(a)
Amount Ryan saved per day = $12
Amount Jen saved per day = $(12 +
r)
Total amount both saved per day
= 12 + 12 +
r = $(24 +
r)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(24 +
r)
= 21 x 24 + 21 x
r = $(504 + 21
r)
Cost of the tablet
= 504 + 21
r + 28
= 504 + 28 + 21
r= $(532 + 21
r)
(b)
If
r = $6,
Cost of the tablet
= 532 + 21 x 6
= 532 + 126
= $658
Answer(s): (a) $(532 + 21
r) or $(21
r + 532); (b) $658
