Billy saved $11 each day and Marion saved $
r more than Billy each day. After 2 weeks, they were still short of $32 to buy a massage chair.
- How much did the massage chair cost? Express your answer in terms of r.
- If r = $15, how much did the massage chair cost?
(a)
Amount Billy saved per day = $11
Amount Marion saved per day = $(11 +
r)
Total amount both saved per day
= 11 + 11 +
r = $(22 +
r)
Number of days in 2 weeks
= 2 x 7
= 14
Total both saved in 2 weeks
= 14(22 +
r)
= 14 x 22 + 14 x
r = $(308 + 14
r)
Cost of the massage chair
= 308 + 14
r + 32
= 308 + 32 + 14
r= $(340 + 14
r)
(b)
If
r = $15,
Cost of the massage chair
= 340 + 14 x 15
= 340 + 210
= $550
Answer(s): (a) $(340 + 14
r) or $(14
r + 340); (b) $550
