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by ruplun » Tue Aug 31, 2010 2:11 am
What is the value of the following expression: 6x^2 + 9y^2?

1. x = 2
2. 6y^2 + 4x^2 = 22

i think the ans is C.
PLEASE advice
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Source: — Data Sufficiency |
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by kmittal82 » Tue Aug 31, 2010 2:37 am
answer should be (B)

Clearly 1 is not sufficient

(2)

6y^2 + 4x^2 = 22

=> 2(3y^2 + 2x^2) = 22
=> 3y^2 + 2x^2 = 11

The question can be reduce to 3(2x^2 +3y^2)

Using the info we found from (2), the value will be 3x 11 = 33.

Hence, (B)
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by ruplun » Tue Aug 31, 2010 2:53 am
thanks a lot
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