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D is on side AB of ABC. We know ABC ~ACD and we know all the marked side lengths.

What is the length of AB?

https://latex.artofproblemsolving.com/7/4/a/74a74a3bc1d11ec4c8039dc5da5a4d88c55f07f5.png

 Oct 8, 2019
 #1
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The answer is 18.

 Oct 31, 2019

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