algebra

One cellular phone carrier charges $26.50 a month and $0.15 a minute for local calls. Another carrier charges $14.50 a month and $0.25 per minute for local calls. For how many minutes is the cost of the plans the same?

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  1. difference is 12 dollars per month
    so for them to be the same the 0.15 needs to catch up to 0.25 by 12 dollars
    12 / 0.25-0.15 = 12 / 0.1 = 120 minutes

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