SOLUTION: The remaining credit after 28 minutes of calls is $20.80, and the remaining credit after 49 minutes of calls is $17.65. What is the remaining credit after 58 minutes of calls?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The remaining credit after 28 minutes of calls is $20.80, and the remaining credit after 49 minutes of calls is $17.65. What is the remaining credit after 58 minutes of calls?       Log On


   

Question 511159: The remaining credit after 28 minutes of calls is $20.80, and the remaining credit after 49 minutes of calls is $17.65. What is the remaining credit after 58 minutes of calls?
Answer by solver91311(24713) About Me  (Show Source):
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$20.80 minus $17.65 is $3.15. 49 minus 28 is 21. Hence, $3.15 was spent for 21 minutes. $3.15 divided by 21 is then the cost per minute.

John

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