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Anonymous
GCD of 81 and 66 is 3.
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GCD(66, 90) = 6
66% of 81= 66% * 81= 0.66 * 81= 53.46
The Greatest Common Divisor/Denominator is 22
81 - 15 = 66
If you mean the greatest common divisor (or factor), the answer is 6