Walking up the escalator

Algebra Level 3

In a shopping centre, an escalator is moving at steady speed between level one and two. There are $$n$$ steps on the escalator. Aaron and Baron are walking up the escalator. Aaron's speed is twice Baron's speed. Given that Aaron walks up $$27$$ steps from level one to level two and Baron takes $$18$$ steps to do so, find $$n$$.

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