盐与水的质量比是2:13,其中盐有6克,一共配制多少克盐水?
= :24=5:8= :40= %
3÷ ==0.75=6: = %
3÷ ==0.6=6: = %.
3:5==9: == .
=0.375=12÷ = %=0.45= %= ÷ .