Question 115
Let $a$, $b$, $c$ be nonnegative real numbers with arithmetic mean $m = \frac{a+b+c}{3}$. Prove that is true
$$
\sqrt{a+\sqrt{b+\sqrt{c}}} + \sqrt{b+\sqrt{c+\sqrt{a}}} + \sqrt{c+\sqrt{a+\sqrt{b}}} \leq 3 \sqrt{m+\sqrt{m+\sqrt{m}}}
$$
$$
\sqrt{a+\sqrt{b+\sqrt{c}}} + \sqrt{b+\sqrt{c+\sqrt{a}}} + \sqrt{c+\sqrt{a+\sqrt{b}}} \leq 3 \sqrt{m+\sqrt{m+\sqrt{m}}}
$$