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value of AB(A+2B)?

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Source: — Data Sufficiency |

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by Ian Stewart » Tue Dec 13, 2011 2:09 pm
kishokbabu wrote:If AB=40, what is the value of AB(A+2B) ?

1) A-B = -18
2) AB = 18


Pls help to solve this
There's something wrong with the question; if AB = 40, as we learn in the stem, then certainly AB cannot be equal to 18, as we're told in Statement 2.
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by neelgandham » Tue Dec 13, 2011 2:10 pm
kishokbabu wrote:If AB=40, what is the value of AB(A+2B) ?

1) A-B = -18
2) AB = 18

Pls help to solve this
I am sure this isn't the right statement(statement 2) because the question stem reads if AB=40 and statement 2 reads AB =18. Can you please correct it ?
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by Anurag@Gurome » Tue Dec 13, 2011 8:21 pm
kishokbabu wrote:If AB=40, what is the value of AB(A+2B) ?

1) A-B = -18
2) AB = 18


Pls help to solve this
As pointed put by Ian and Neelgandham, statement 2 is definitely not correct. Please check and post the correct one.
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by kishokbabu » Tue Dec 13, 2011 9:06 pm
Hi,
Thanks to Anurag,Neelgandham & Ian stewart,

Actually this question, I have taken from one of the free Online CAT exam(one of the reputed GMAT exam preparatory company)

While taking the exam also i spent lot of time for this qn and even after the exam also i am unable to get the answer. They have mentioned the correct answer as B (statement 2 alone is sufficient).

So to get a clear idea from the members, I have posted this qn. Now i am sure that they have given a wrong question.

Thanks to you all onceagain,
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