Ahmad saved $11 each day and Ivory saved $
x more than Ahmad each day. After 5 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 x.
- If x = $2, how much did the mobile phone cost?
(a)
Amount Ahmad saved per day = $11
Amount Ivory saved per day = $(11 +
x)
Total amount both saved per day
= 11 + 11 +
x = $(22 +
x)
Number of days in 5 weeks
= 5 x 7
= 35
Total both saved in 5 weeks
= 35(22 +
x)
= 35 x 22 + 35 x
x = $(770 + 35
x)
Cost of the mobile phone
= 770 + 35
x + 31
= 770 + 31 + 35
x= $(801 + 35
x)
(b)
If
x = $2,
Cost of the mobile phone
= 801 + 35 x 2
= 801 + 70
= $871
Answer(s): (a) $(801 + 35
x) or $(35
x + 801); (b) $871
