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The sum of the date of all Sundays in a month is 85,the date

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The sum of the date of all Sundays in a month is 85,the date of last Sunday is ( )th
The sum of the date of all Sundays in a month is 85,the date
31,设第一个星期天日期为x,有四个星期天,则,4x+42=85无解
五个星期天,5x+70=85,x=3,最后一个星期天日期是3+4x7=31