picture is blurry but if they are similar find the scale between the known sides
smaller triangle bottom looks like it says 8?
the larger one is 16
8/16 = 0.5 so the smaller one is half the size of the larger one
so half of 8 is 4 so y = 4
since they are similar the angles would stay the same so angle B would be the same as s which is shown as 27 degrees.