please help! dont solve using matlab.

3) [25 points] A ternary alloy with composition 35at%A,30 at %B,35at%C solidifies through a ternary eutectic reaction to a mixture of , and with the following compositions: =80at%A,5at%B,15at%C=10at%A,70at%B,20at%C=10at%A,20at%B,70at%C a) Plot the alloy and phase compositions. b) What are the fractions of the , and phases in the microstructure? c) If it is desired to increase the relative amount of the phase in the eutectic microstructure to 50% with equal amounts of the and phases identify the necessary alloy composition