2000 AMC 10 竞赛试题/第4题
Chandra pays an on-line service provider a fixed monthly fee (每月固定费用) plus an hourly charge for connect time. Her December bill was ![]()
, but in January her bill was ![]()
because she used twice as much connect time as in December. What is the fixed monthly fee?
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Let
be the fixed fee, and
be the amount she pays for the minutes she used in the first month.
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We want the fixed fee, which is ![]()
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