Gabriel saved $10 each day and Lynn saved $
v more than Gabriel each day. After 6 weeks, they were still short of $31 to buy a mobile phone.
- How much did the mobile phone cost? Express your answer in terms of v.
- If v = $4, how much did the mobile phone cost?
(a)
Amount Gabriel saved per day = $10
Amount Lynn saved per day = $(10 +
v)
Total amount both saved per day
= 10 + 10 +
v = $(20 +
v)
Number of days in 6 weeks
= 6 x 7
= 42
Total both saved in 6 weeks
= 42(20 +
v)
= 42 x 20 + 42 x
v = $(840 + 42
v)
Cost of the mobile phone
= 840 + 42
v + 31
= 840 + 31 + 42
v= $(871 + 42
v)
(b)
If
v = $4,
Cost of the mobile phone
= 871 + 42 x 4
= 871 + 168
= $1039
Answer(s): (a) $(871 + 42
v) or $(42
v + 871); (b) $1039
