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設甲原來x噸,乙原來y噸 x+y=300 x(1-2/5)+20=y(1+2/5) 3x+100=7y x=200(噸) y=100(噸) 甲原來200噸,乙原來100噸 甲+乙=300 7乙/5-3甲/5=20 乙=100 甲=200
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