Ratio of maximum to minimum intensity from the intensity or amplitude ratio of two sources

The same question, asked 3 times: May 2022 S1*, 2 May 2023 S1*, 11 Apr 2026 S1. Every wording below, oldest first.

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Question 1
May 2022 S1
17 $Two waves are superimposed whose ratio of intensities is 9:1. The ratio of maximum and minimum intensity is$
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Question 2
2 May 2023 S1
4 $The intensity of light coming from one of the slits in Young's double slit experiment is double the intensity from the other slit. The ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed is$
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Question 3
11 Apr 2026 S1
143 $3 : 1$
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Question 1