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MBAHopef
Joined: 21 Jan 2013
Last visit: 13 Jun 2016
Posts: 35
Given Kudos: 5
Schools: Booth '17 (A$) Johnson '18 (A$) Stern '18 (A)
Products:
21 Feb 2015, 13:32
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
83% (00:51) correct
17%
(01:04)
wrong
based on 175
sessions
History
Date
Time
Result
Not Attempted Yet
21 Feb 2015, 13:47
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If 4*a^2 = 9 what is the value of a?
4*a^2 = 9;
a^2 = 9/4;
a = 3/2 or a = -3/2
(1) a > 0. a is positive, so a = 3/2. Sufficient.
(2) 4*a = 6 --> a = 6/4. Sufficient.
Answer: D.
4*a^2 = 9;
a^2 = 9/4;
a = 3/2 or a = -3/2
(1) a > 0. a is positive, so a = 3/2. Sufficient.
(2) 4*a = 6 --> a = 6/4. Sufficient.
Answer: D.
21 Feb 2015, 18:20
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Hi BSMSUFL17,
This DS question has some great "pattern matching" shortcuts built into. If you recognize the shortcuts, then you don't need to do ANY calculations at all to get to the correct answer.
We're told that 4(A^2) = 9. We're asked for the value of A.
From the given equation, we know that there will be 2 answers (one solution is positive and one is negative), so the answer to the question can only be one of two possibilities.
Fact 1: A > 0
This tells us that A is the "positive option" from the two possibilities.
Fact 1 is SUFFICIENT.
Fact 2: 4A = 6
This is a "one variable, one equation set-up"; there's nothing "special" about it (no absolute values, no exponents, etc.), so there is only ONE solution for A.
Fact 2 is SUFFICIENT.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
This DS question has some great "pattern matching" shortcuts built into. If you recognize the shortcuts, then you don't need to do ANY calculations at all to get to the correct answer.
We're told that 4(A^2) = 9. We're asked for the value of A.
From the given equation, we know that there will be 2 answers (one solution is positive and one is negative), so the answer to the question can only be one of two possibilities.
Fact 1: A > 0
This tells us that A is the "positive option" from the two possibilities.
Fact 1 is SUFFICIENT.
Fact 2: 4A = 6
This is a "one variable, one equation set-up"; there's nothing "special" about it (no absolute values, no exponents, etc.), so there is only ONE solution for A.
Fact 2 is SUFFICIENT.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
