The following figure is the phase diagram for Pb-Sn system. The 5 liquid alloys (labeled in the diagram) were slowly cooled down to their final regions. They passed different regions during cooling. If liquid alloy #2 was cooled to temperature B, Tb please identify the existing phases and roughly estimate each phase's composition by reading the diagram, and calculate their relative percentages (the liquid B alloy has a composition of 70Pb30Sn).
