设甲为x,乙为yx*3/5=1/4*(x+y)x*(3/5-1/4)=1/4*y所以(12-5)/20=7/20x:y=1/4*20/7=5:7
5:7甲*3/5=(甲+乙)*1/4甲*7/20=乙*1/4甲:乙=5:7
7:5