3. (a) Temperature of 1 kg of the alloy (50% A-50 %B) shown in Figure 9.31 (or shown below) is lowered slowly until the liquid-solution composition is 18 wt% B and the solid-solution composition is 66% B. Calculate the amount of each phase (Liquid and Solid phases). (b) If the alloy composition is changed 65% A-35% B, and at the same temperature mentioned at (a) which means the liquid-solution composition (18wt%B) and solid-solution composition (66wt%B) remain the same). Calculate the amount of each phase (Liquid and Solid phases). (See Sample Problem 9.3) (10 Points) Liquides Ming point LISS T point Melting pol A 18 B 100 50 66 30 40 60 80 104-S 100 49 20 0%A Composition (%) 4. Cosider Alloy 1 (50% Pb-50%Sn): (a) For a temperature of 200C, determine (1) the phases present, (2) their compositions, and (3) their relative amounts (expressed in weight percent).