11. Using the lead-tin phase diagram, determine the liquid and solid phase compositions for a nominal composition of 40%Sn and 60%Pb at 204C(400F). 12. For the preceding problem, use the inverse lever rule to determine the proportions of liquid and solid phases present in the alloy. 13. Using the lead-tin phase diagram, determine the liquid and solid phase compositions for a nominal composition of 90%Sn and 10%Pb at 204C(400F)