In \triangle ABC, points X and Z are on \overline{AB} and Y is on \overline{AC} such that \overline{XY}\parallel \overline{BC} and \overline{ZY}\parallel \overline{XC}. If AZ = 8 and ZX = 4, then what is XB?
\( \text{In }\triangle ABC, \text{ points X and Z are on }\overline{AB} \text{and Y is on } \overline{AC} \text{such that }\overline{XY}\parallel \overline{BC} \text{ and } \overline{ZY}\parallel \overline{XC}.\\\text{ If AZ = 8 and ZX = 4, then what is XB?}\)
+159 
