MATH 110 How many minutes did he talk on the weekends

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MATH 110 How many minutes did he talk on the weekends

Nicks telephone company charges $0.01 per minute for weekend calls and $0.07 per minute for calls made on weekdays. this month nick was billed for 636 minutes. the charge for these minutes was $12.60. How many minutes did he talk on the weekends and how many minutes did he talk on the weekdays?