Seth saved $8 each day and Lucy saved $
x more than Seth each day. After 3 weeks, they were still short of $31 to buy a tablet.
- How much did the tablet cost? Express your answer in terms of x.
- If x = $5, how much did the tablet cost?
(a)
Amount Seth saved per day = $8
Amount Lucy saved per day = $(8 +
x)
Total amount both saved per day
= 8 + 8 +
x = $(16 +
x)
Number of days in 3 weeks
= 3 x 7
= 21
Total both saved in 3 weeks
= 21(16 +
x)
= 21 x 16 + 21 x
x = $(336 + 21
x)
Cost of the tablet
= 336 + 21
x + 31
= 336 + 31 + 21
x= $(367 + 21
x)
(b)
If
x = $5,
Cost of the tablet
= 367 + 21 x 5
= 367 + 105
= $472
Answer(s): (a) $(367 + 21
x) or $(21
x + 367); (b) $472
