Ahmad saved $10 each day and Anna saved $
b more than Ahmad each day. After 6 weeks, they were still short of $30 to buy a massage chair.
- How much did the massage chair cost? Express your answer in terms of b.
- If b = $15, how much did the massage chair cost?
(a)
Amount Ahmad saved per day = $10
Amount Anna saved per day = $(10 +
b)
Total amount both saved per day
= 10 + 10 +
b = $(20 +
b)
Number of days in 6 weeks
= 6 x 7
= 42
Total both saved in 6 weeks
= 42(20 +
b)
= 42 x 20 + 42 x
b = $(840 + 42
b)
Cost of the massage chair
= 840 + 42
b + 30
= 840 + 30 + 42
b= $(870 + 42
b)
(b)
If
b = $15,
Cost of the massage chair
= 870 + 42 x 15
= 870 + 630
= $1500
Answer(s): (a) $(870 + 42
b) or $(42
b + 870); (b) $1500
