there have twelve ball on the table, if have one heavy or linght, give you a scales, can you find it on three times? help me, my uncle give me one day finsh this question, help me,my friend.
tell you i don't know,but it seems that they discussed this question long long ago ,look for it in the old file......... 我汗,怎么说起来那么别扭!还是母语好呀!!!!!!!!!!!!!
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