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The symbol - represents one of the following...

This topic has 1 expert reply and 0 member replies

The symbol - represents one of the following...

Post Tue Oct 31, 2017 9:13 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    The symbol - represents one of the following operations: addition, subtraction, multiplication, or division. What is the value of 7-4?

    (1) 4-7 < 1

    (2) 4-3 > 1

    The OA is C.

    I need help to solve this DS question. Please, can any expert explain it for me? 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 10, 2017 1:09 am
    swerve wrote:
    The symbol - represents one of the following operations: addition, subtraction, multiplication, or division. What is the value of 7-4?

    (1) 4-7 < 1

    (2) 4-3 > 1

    The OA is C.

    I need help to solve this DS question. Please, can any expert explain it for me? Thanks.
    We have to the value of 7-4. To get this, we must know what operation - does.

    Question rephrased: What operation - does?

    (1) 4-7 < 1

    1. Assuming that - is addition, then 4-7 < 1 => 4 + 7 (= 11) > 1. Not correct.
    2. Assuming that - is subtraction, then 4-7 < 1 => 4 - 7 (= -3) < 1. Correct.
    3. Assuming that - is multiplication, then 4-7 < 1 => 4 x 7 (= 28) < 1. Not correct.
    4. Assuming that - is division, then 4-7 < 1 => 4 ÷ 7 (= 0.5) < 1. Correct.

    - can either be subtraction or division. No unique answer. Insufficient.

    (2) 4-3 > 1

    1. Assuming that - is addition, then 4-3 > 1 => 4 + 3 (= 7) > 1. Correct.
    2. Assuming that - is subtraction, then 4-3 > 1 => 4 - 3 (= 1) = 1. Not correct.
    3. Assuming that - is multiplication, then 4-3 > 1 => 4 x 3 (= 12) > 1. Correct.
    4. Assuming that - is division, then 4-3 > 1 => 4 ÷ 3 (= 1.33) > 1. Correct.

    - can either be addition, multiplication or division. No unique answer. Insufficient.

    (1) and (2) combined:

    After combing, we get that - is a division. No unique answer. Sufficient.

    The correct answer: C

    Hope this helps!

    -Jay
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    Manhattan Review GMAT Prep

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    Thanked by: swerve

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