GMAT Math Practice Test #1

Answer: C - HCF of three numbers is 12. So the lowest possible number can be 12 or its multiples 24, 36. Let first number be 12. The three numbers are in the ratio of 1:2:3. So the second number is 12 x 2 and third number is 12 x 3. Ans. 12, 24, and 36.

Key takeaway: The Highest Common Factor (HCF) is the largest positive integer that divides all the given numbers.