Depending on the context, BMI could mean Body Mass Index. It is a rough measure of whether or not a person is overweight (or underweight) and is calculated as the mass (in kilograms) divided by the square of the height (in metres). A BMI of 30 is the borderline between overweight and obese.
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it could mean negative 30 derees, negative 30 etc. you would need the context
Geometric mean of 10 and 30 is 17.320508075688774. Look at link: "Calculation of the geometric mean of two numbers".
If you mean: 7x-30 = 180 then the value of x is 30
30 days has September, April, June, and November
It means something is 30 degrees north latitude of the equator.