Can someone help me with this problem I have to use ratios

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coooool222

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The answer is 15 but i dont know how to do it. There are three triangles and im supposed to sue ratios. If anyone can help me explain this question please do.
 
What have you learned about similar triangles and ratios?
 
Theorem 7.5 if the altitude is drawn to the hypotense of a right triangle then the two triangles formed are similar to the original triange
 
Ok, you identified similar triangles, but you haven't answered my question.
 
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