What is the missing area 11 + = * 16 = * 2=209

Lets say x, y, z are the unknown variables,

11+x=y*16=z/2=209

so first solve for z

z/2=209

z=418

y*16=z/2

y=418/32

y=209/16

x+11=y*16

x=209/16*16-11

x=209-11

x=198

missing area is

11+198=209/16=418/2=209