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I have trouble with piecewise functions.

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If$f(x) = \begin{cases} 2x-5 &\quad \text{if } x \ge 3, \\ -x + 5 &\quad \text{if } x < 3, \end{cases}$then for how many values of $x$ is $f(f(x)) = 3$?

Dec 31, 2021

f(f(1)) = f(4) = 3.  The only solution is x = 1, so the number of solutions is $\boxed{1}$.