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VTMO 2026 - Grade 9 - Final - SET 3 - Self-study Question 2

VTMO · VTMO 2026 - Grade 9 - Final - SET 3 - Self-study

Question 2

For two nonnegative real numbers $a,b$, their arithmetic and geometric means are $\dfrac{a+b}{2}$ and $\sqrt{ab}$, respectively. For example, the numbers 2 and 8 have arithmetic mean 5 and geometric mean 4. Find two distinct positive integers whose arithmetic and geometric means are two-digit numbers made from the same two digits in opposite orders.