Mk, i don’t know if this is hundred percent correct. Alright so, first add 12 and 16. Those two numbers equal 28. Every triangle equals 180, so if you subtract 28 from 180 that equals 156. The missing X is 156! Sorry if the explanation is kinda bad. My english isn’t very good. Also, if you need your answer to be rounded to the nearest tenth, it will be 160. Hope this helps!
