Advanced Math practice question

Answer: 9

√(4n) = 2√n, so √n + 2√n = 3√n = 9 and √n = 3, giving n = 9.

Common wrong answers

If you answered 3

3 is √n, not n.

If you answered 36

36 is 4n.

If you answered 81

81 squares 9 without dividing by 3 first.

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