甲数比乙数多20%,乙数就比甲数少qingjieshishuoming wodetongxuejiushibuxiangxinwo heng

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甲数比乙数多20%,乙数就比甲数少qingjieshishuoming wodetongxuejiushibuxiangxinwo heng
甲数比乙数多20%,乙数就比甲数少
qingjieshishuoming wodetongxuejiushibuxiangxinwo heng

甲数比乙数多20%,乙数就比甲数少qingjieshishuoming wodetongxuejiushibuxiangxinwo heng
乙看做1
则甲是1+20%=1.2
所以乙比甲少(1.2-1)÷1.2×100%=16.7%

20%÷(1+20%)
=16.67%

设乙数为x,则甲数为1.2x,(1.2x-x)/1.2x=1/6,即乙数比甲数少1/6