Here we know 2 angles of the left triangle will be 75 and 45. using this, the bottom right angle will be 60
Now we can find the bottom left angle of the triangle on the right, which will be 41.
Again, since a triangle has 180 degrees alltogether, the bottom right angle of the right triangle will be 71.
Finally, using this you know that ?=180-71=109
Hope this helped :)