Amafic rock has 30 % diopside and 70% anorthite. on partial melting, the ratio of diopside and anorthite in the first melt is (upto 2 decimal)

As diopside and anorthite is a binary Eutectic system what ever the bulk percentage may be if we heat the solid rock in which as per question 30 %diopside and 70% anorthite present...