Tommy saved $11 each day and Tina saved $
m more than Tommy each day. After 3 weeks, they were still short of $32 to buy a hard drive.
- How much did the hard drive cost? Express your answer in terms of m.
- If m = $19, how much did the hard drive cost?
(a)
Amount Tommy saved per day = $11
Amount Tina saved per day = $(11 +
m)
Total amount both saved per day
= 11 + 11 +
m = $(22 +
m)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(22 +
m)
= 21 x 22 + 21 x
m = $(462 + 21
m)
Cost of the hard drive
= 462 + 21
m + 32
= 462 + 32 + 21
m= $(494 + 21
m)
(b)
If
m = $19,
Cost of the hard drive
= 494 + 21 x 19
= 494 + 399
= $893
Answer(s): (a) $(494 + 21
m) or $(21
m + 494); (b) $893
