solve it clearly please

A 50 wt\% Pb50 wt\% Mg alloy is slowly cooled from 700C At what temperature does the first solid phase form? What is the composition of this solid phase? At what temperature does the liquid solidity? What is the composition of this last remaining liquid phase? A 50 wt\% Pb50 wt\% Mg alloy is slowly cooled from 700C At what temperature does the first solid phase form? What is the composition of this solid phase? At what temperature does the liquid solidity? What is the composition of this last remaining liquid phase