College Math CLEP Prep Practice Exam

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What is the greatest common factor of 12x and 18x?

The correct answer is: 6x

The greatest common factor (GCF) is the largest number that can evenly divide into both 12x and 18x. In this case, the only number that can evenly divide into both 12x and 18x is 6. Option A (3x) is incorrect because it cannot evenly divide into 12x. Option C (9x) is incorrect because it cannot evenly divide into 18x. Option D (12x) is incorrect because it cannot evenly divide into either 12x or 18x. The only option that is a common factor of both 12x and 18x is B (6x), making it the greatest common factor.