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805+ (Hard)|   Inequalities|      
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EBITDA
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If a / b > 2, is 3a + 2b < 18? 31 Jul 2016, 10:48
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

95% (hard)

Question Stats:

32% (02:52) correct 68% (02:44) wrong based on 32 sessions

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If a / b > 2, is 3a + 2b < 18?

1) a - b < 2
2) b - a < 2

Please explain in detail your answer and also what is the fastest way to approach the question.

Thank you.
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A
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rohit8865
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If a / b > 2, is 3a + 2b < 18? 31 Jul 2016, 11:36
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EBITDA
If a / b > 2, is 3a + 2b < 18?

1) a - b < 2
2) b - a < 2

Please explain in detail your answer and also what is the fastest way to approach the question.

Thank you.
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as a/b>2 means both a and b have same sign but none of them is 0
now proceed with 2 sets of values for each positive side and 2 sets for negative sides..
having one integer values and another fractional/decimal..
Also if u see a-b-b/b<0 we have a max. value of a-b=1.9--------> so put value of a-b <2 in a-b-b/b<0...
(1) any value of a and b >1 cannot satisfy a/b>2 and a-b<2
but any -ve satisfy both the equation and we have a yes as our answer.
suff..
(2)take a=10 b=2 for a NO
take a=0.4 and b=0.1 for a Yes situation..
insuff...

Ans A
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If a / b > 2, is 3a + 2b < 18? 31 Jul 2016, 14:38
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I am getting D. I would like to know where I am getting it wrong. Can you please elaborate how you got A?? What is OA??


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If a / b > 2, is 3a + 2b < 18? 31 Jul 2016, 14:48
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Could anyone else please provide alternative ways of solving this problem?

Thank you.
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If a / b > 2, is 3a + 2b < 18? 31 Jul 2016, 15:37
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First thing is always to note that if a/b > 2, then a & b are same sign.

Now manipulate the given formula from a/b>2 --> a > 2b

Data 1: a - b < 2
Manipulate this formula in terms of a: so a < b + 2
Now we know that "a" > 2b and a < b + 2.
The only way for the above to be true is if b < 2.
Now for a, if we know b's limit is 2, than we know a - 2 < 2, so a < 4.
If we look at 3a + 2b and plug in our greatest limits of b =2 and a = 4 we get 3(4) + 2(2) = 16 which is less than 18.
Therefore, A is sufficient.

Data 2: b - a 2
Similar manipulation to part A reveals that a > b - 2 and a > 2b, this does not give us any limitations on the values.
Therefore insufficient.

Therefore answer is A.

please leave kudos, first time posting!
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If a / b > 2, is 3a + 2b < 18? 01 Aug 2016, 01:46
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doctagmat
First thing is always to note that if a/b > 2, then a & b are same sign.

Now manipulate the given formula from a/b>2 --> a > 2b

Data 1: a - b < 2
Manipulate this formula in terms of a: so a < b + 2
Now we know that "a" > 2b and a < b + 2.
The only way for the above to be true is if b < 2.
Now for a, if we know b's limit is 2, than we know a - 2 < 2, so a < 4.
If we look at 3a + 2b and plug in our greatest limits of b =2 and a = 4 we get 3(4) + 2(2) = 16 which is less than 18.
Therefore, A is sufficient.

Data 2: b - a 2
Similar manipulation to part A reveals that a > b - 2 and a > 2b, this does not give us any limitations on the values.
Therefore insufficient.

Therefore answer is A.

please leave kudos, first time posting!
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I looked at the first two lines of your response and found a flagrant error (marked in red above) that made me disregard the rest of your explanation.

You say that: a/b > 2 --> a > 2b

If a = -3 and b = -1 ---> -3/-1 = 3 > 2. From this does not follow that: a > 2b ---> -3/-1 * -1 = -3 > 2*-1 = -2

Can anyone else please explain in detail the answer to this problem and also what is the fastest way to solve it?

Thank you.
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If a / b > 2, is 3a + 2b < 18? 01 Aug 2016, 02:00
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EBITDA
If a / b > 2, is 3a + 2b < 18?

1) a - b < 2
2) b - a < 2

Please explain in detail your answer and also what is the fastest way to approach the question.

Thank you.
Show more

This is a copy of the following question: if-x-y-2-is-3x-2y-18-1-x-y-is-less-than-89225.html

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