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1. The numbers 55 and 27 are "relatively prime", meaning they have no common factor other than 1.
The square root of 55 is an irrational number, meaning it never ends and doesn't have a repeating digit pattern, so it has an infinite number of digits.
-50
"Percent" is the same as "of 100" so the answer is 5.5
90% of 55= 90% * 55= 0.9 * 55= 49.5