甲:乙=1:3=2:6甲:丙=2:5 =>甲:乙:丙=2:6:5 =>甲2份;乙6份;丙5份共13份=>130/13=10...一份=>甲=10*2=20 ;乙=10*6=60 ;丙=10*5=50..........ans
