any one tell me how to get c alpha value 11 wt% and bita 99wt% values?

Consider the Pb-Sn system, specifically an alloy of composition 40wt%Sn60wt%Pb is solidified. Find the phase presented and their composition and amount at 150C and 220C. - For a 40 wt % Sn-60 wt % Pb alloy (C0=40 wt %Sn) at 150C : -- the phases are: + -- the compositions of phases: C=11wt%SnC=99wt%Sn -- the relative amount of each phase: WW=R+SS=CCCC0=99119940=8859=0.67=R+SR=CCC0C=99114011=8829=0.33(or10.67) NOTE: Please use the equations with caution. The actual phases should be considered in specific calculations