设乙每天做y个,甲每天做y+5个,总数为x个
6(y+y+5)+14(y+5)=3x/5
12y+30+14y+70=3x/5
3x-130y=500
(y+y+5)24=x
48y=x-120
y=(x-120)/48
3x-(130x-15600)/48=500
144x-130x=24000-15600
14x=8400
x=600