Mom works 2 days and takes 1 day off, and Dad works 3 days and takes 1 day off. If they start working at the same time from July 1, how many days in July can they both rest at the same time?
妈妈上2天班休息1天，爸爸上3天班休息1天．如果他们从7月1日开始同时上班，那么7月份他俩共有多少天可以同时休息．
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