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Answer: $105$


$\begin{align}
45&= 3^2 \times 5\\
60 &= 2^2 \times 3 \times 5\\
91 &= 7 \times 13\\
105&=3 \times 5 \times 7\\
330 &= 2 \times 3 \times 5 \times 11
\end{align}$


This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.