丙做试题|六年级奥数题及答案
甲、乙、丙三人共做了183道数学题，乙做的题比丙的2倍还少4道，甲做的题比丙的3倍多7道。丙做了多少道题？
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解答：所以丙做的题目为:（183+4-7）/(1+2+3)=30 道
