Lui saved $9 each day and Opal saved $
y more than Lui each day. After 5 weeks, they were still short of $30 to buy a projector.
- How much did the projector cost? Express your answer in terms of y.
- If y = $4, how much did the projector cost?
(a)
Amount Lui saved per day = $9
Amount Opal saved per day = $(9 +
y)
Total amount both saved per day
= 9 + 9 +
y = $(18 +
y)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(18 +
y)
= 35 x 18 + 35 x
y = $(630 + 35
y)
Cost of the projector
= 630 + 35
y + 30
= 630 + 30 + 35
y= $(660 + 35
y)
(b)
If
y = $4,
Cost of the projector
= 660 + 35 x 4
= 660 + 140
= $800
Answer(s): (a) $(660 + 35
y) or $(35
y + 660); (b) $800
