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.
- In the upper triangle, the shortest side has length 16 , and the middle side has length 24 . In the lower triangle, the shortest side has length 12 , the middle side has length 18 , and the longest side has length 24. Find the length, $x$ , of the longest side of the upper triangle.

A) $x=32$
B) $x=30$
C) $x=40$
D) $x=24$