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If 0 < a/b < 1 and 0 < a, what is the value of inte

This topic has 1 expert reply and 0 member replies

If 0 < a/b < 1 and 0 < a, what is the value of inte

Post Fri Nov 03, 2017 9:18 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    If 0 < a/b < 1 and 0 < a, what is the value of integer a?

    (1) The least common denominator of a/b and 1/5 is 10
    (2) b = 2

    The OA is B.

    I need help to solve this DS question. Please can any expert explain why that is the correct answer? Thanks.

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    Post Fri Nov 03, 2017 10:02 am
    LUANDATO wrote:
    If 0 < a/b < 1 and 0 < a, what is the value of integer a?

    (1) The least common denominator of a/b and 1/5 is 10
    (2) b = 2

    The OA is B.

    I need help to solve this DS question. Please can any expert explain why that is the correct answer? Thanks.
    Statement 1
    Case 1: a =1 and b = 2. (the LCM of 2 and 5 is 10.)
    Case 2: a = 3 and b = 10 (the LCM of 5 and 10 is 10.)
    We can get more than one value for a, so this statement alone is not sufficient to answer the question.

    Statement 2:
    If a/b < 1, we know that if b = 2, a/2 < 1 and a < 2. We also know that a is positive. Well, there's only one positive integer less than 2, so a = 1. Sufficient. The answer is B

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