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The answer is 63.

LCM of 63 and 66 is 1386.

GCF of 63 and 66 is 3. Given one number A, the formula for finding B, the unknown number, is : (LCM/A) x GCF = B (1386/66) x 3 = 21 x 3 = 63

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Q: The LCM of two numbers is 1386 and the GCF is 3 so if one number is 66 what is the other?
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