Trig problem

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Dencology

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guys how do you answer this.

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Can we assume that the angle on top is also 90 degrees? In other words, how do you know that the acute angle up there is 47? There's nothing to suggest that the vertical line (Y) and the horizontal line on top make a right angle.

Otherwise the answer is [20 tan (43)] or [20 / tan(47)].
 
This problem is unrealistic, because there would be a given list of answer choices. Give us the choices, and the answer would be solved in 5 second flat.
 
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