Billy saved $12 each day and Lynn saved $
y more than Billy each day. After 4 weeks, they were still short of $31 to buy a computer.
- How much did the computer cost? Express your answer in terms of y.
- If y = $13, how much did the computer cost?
(a)
Amount Billy saved per day = $12
Amount Lynn saved per day = $(12 +
y)
Total amount both saved per day
= 12 + 12 +
y = $(24 +
y)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(24 +
y)
= 28 x 24 + 28 x
y = $(672 + 28
y)
Cost of the computer
= 672 + 28
y + 31
= 672 + 31 + 28
y= $(703 + 28
y)
(b)
If
y = $13,
Cost of the computer
= 703 + 28 x 13
= 703 + 364
= $1067
Answer(s): (a) $(703 + 28
y) or $(28
y + 703); (b) $1067
