Sergio's internet provider charges its customers $14 per month plus 5 cents per minute of on-line usage. sergio received a bill from the provider convering a 2 month period and was charged a total of $65.

Sergio's internet provider charges its customers $14 per month plus 5 cents per minute of on-line usage. sergio received a bill from the provider convering a 2 month period and was charged a total of $65. how many minutes did he soend on-line during that period ?

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