For the Pair of Similar Triangles, Find the Length of the Indicated

Multiple Choice

For the pair of similar triangles, find the length of the indicated side.
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In the upper triangle, the shortest side has length 12, and the middle side has length 18. In the lower triangle, the shortest side has length 8, the middle side has length 12, and the longest side has length 16. Find the length, x, of
The longest side of the upper triangle.

A) x = 24
B) x = 23
C) x = 16
D) x = 30