Elijah saved $11 each day and Risa saved $
f more than Elijah each day. After 4 weeks, they were still short of $32 to buy a computer.
- How much did the computer cost? Express your answer in terms of f.
- If f = $5, how much did the computer cost?
(a)
Amount Elijah saved per day = $11
Amount Risa saved per day = $(11 +
f)
Total amount both saved per day
= 11 + 11 +
f = $(22 +
f)
Number of days in 4 weeks
= 4 x 7
= 28
Total both saved in 4 weeks
= 28(22 +
f)
= 28 x 22 + 28 x
f = $(616 + 28
f)
Cost of the computer
= 616 + 28
f + 32
= 616 + 32 + 28
f= $(648 + 28
f)
(b)
If
f = $5,
Cost of the computer
= 648 + 28 x 5
= 648 + 140
= $788
Answer(s): (a) $(648 + 28
f) or $(28
f + 648); (b) $788
