设甲为x吨,乙为y吨,x-y=50 x=y+50
代入y+30-(x-30)/y+30=25%
可得y+30-(y+50-30)/y+30=0.25
y+30-y-20=0.25y+7.5
10=0.25y+7.5
0.25y=2.5
y=10
x=607
手机有点乱,最后结果甲60吨乙10吨
设甲为x吨,乙为y吨,x-y=50 x=y+50
代入y+30-(x-30)/y+30=25%
可得y+30-(y+50-30)/y+30=0.25
y+30-y-20=0.25y+7.5
10=0.25y+7.5
0.25y=2.5
y=10
x=607
手机有点乱,最后结果甲60吨乙10吨