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So, we need the Greatest Common Factor of the two numbers, 54 and 27, right?
first, is one maybe a multiplication of the other?
yes, it is! in fact, 54 is 27*2; 53 is 27 multiplied by 2.
that means that 27 IS the Greatest Common Factor of the two!
1/8 is in it 3/2 if that is it