20k means 20 karat gold
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Variance = 0 means they are all the same. So the question is simplified to: what 5 identical values have a mean of 20. Since they are identical, their mean value is the same as themselves. So the answer, trivially, is [20, 20, 20, 20, 20].
20 girls to 1 guy
If you mean: 4/20 then it is 1/5 in its simplest form
If you mean: 20 -3x = 14 then the value of x is 2
square root of (6 x 20) = square root of (120) = 10.95