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Sajan sarthak Best Answer
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 they will melt for the first time at Eutectic point . so diopside anorthite eutectic percentage is An 42 Di 58 so ratio will be Di/An= 58/42=1.38 and remember the bulk solid composition does not matter..