How to find $x$?

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How to find $x$? So I've founded an answer: $11$. I'm not sure too. Thanks!

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What is the last angle in the triangle ACE? You already know two, so you can find it.

The other angle at A can then be found since the two angles at A add up to 90°.

Now you know two angles in AEB, and you can find the remaining.


The general idea to solving these questions is that when you know two angles in a triangle, you can find the last, and when you know that two angles add up to 90° or 180°, you can find the other one.