甲乙两数的和是24,甲与乙的比是3:5,甲数是 .
÷8===15÷ = ÷32= (填小数)
0.3==12÷ = :30= %
÷40=20: =0.8= : .
3÷ == :12=六成= %
0.25= ÷8== : .