甲筐:5÷(7/9-3/5) =5÷8/45 =225/8乙筐:225/8×3/5=675/40两筐共重45千克
设甲为x,乙为3/5x(3/5x+5)/(x-5)=7/927/5x+45=7x-352/5x=80x=2003/5x=120x+3/5x=320