Evaluate nested square roots from the innermost outwards

This type of question, asked 2 times: 2 Mar 2023 Tier II, 6 Mar 2023 Tier II. All 2 questions below, oldest first.

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Question 1
2 Mar 2023 Tier II
12 $\sqrt{8 + \sqrt{1681}}$
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Question 2
6 Mar 2023 Tier II
6 $\frac{\sqrt{10 + \sqrt{25 + \sqrt{108 + \sqrt{154 + \sqrt{225}}}}}}{\sqrt{16 + 19.25 \times 4^2}}$
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