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|PF| = 
= 9.
|CF| = 18 + 9 = 27.
Hint (instruction).
1. In any triangle, medians are concurrent, i.e. three medians have the common intersection.
2. The common intersection point divides each median in proportion 2:1 counting from the corresponding vertex.
Regarding these properties, see the lesson Medians of a triangle are concurrent in this site.
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