16 W 20 To solve this problem, I would use the The value of x is If necessary, round to the nearest tenth.

Angle bisector theorem : if a ray bisects an angle of a triangle, it divides the opposite side of the triangle into segments that are proportional to the other two sides.
x/12= 20/16
Solve for x
16*x = 20*12
16x = 240
x= 240/16
x= 15