Harley1980 wrote:
Elvin's monthly telephone bill is the sum of the charge for the calls he made during the month and a fixed monthly charge for Internet service. Elvin's total telephone bill for January was $48 and Elvin's total telephone bill for February was 76$. If Elvin's charge for the calls he made in February was twice the charge for the calls he made in January, what is Elvin's fixed monthly charge for Internet service?
A) $5
B) $10
C) $14
D) $20
E) $28
Bill = Fixed Charge + Charge of Calls madein Jan, Bill = Fixed Charge(Let, y) + Charge of calls made in Jan (Let, x) = $48
in Feb, Bill = Fixed Charge (Let, y) + Charge of calls made in Feb (Then, 2x) = $76
i.e. x+y = 48
and 2x+y = 76
Take the difference if two equations
i.e. (2x+y) - (x+y) = 76 - 48
i.e. x = 28
i.e. Fixed Monthly Charge, y = 20Answer: Option
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