题目描述：
一袋大米第一天用去他的三分之一第二天用去三分之一千克,两天用去这袋大米的五分之2这袋大米原有多少千克一袋大米,第一天用去他的三分之一,第二天用去三分之一千克,两天用去这袋大米的五分之2这袋大米原有多少千克?RT
答案解析
【答案】1/3÷（2/5-1/3）=5千克
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