Question 2705
 The congruence of triangles ACD  XZY means the correspondence
 A<-->X, C<-->Z and D<-->Y 
 Also, DB<-->YW means B<-->W. 
 
 
 Hence, DB= 6= 2x+1, 
 So, to solve for x, x = 5/2 and we have XY = x+4 = 6.5