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by finance » Sun Jul 03, 2011 6:30 am
Given that A = 3y + 8x, B = 3y - 8x, C = 4y + 6x, and D = 4y - 6x, what is the value of x*y?
AB + CD = -275
AD - BC = 420
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Source: — Data Sufficiency |
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by r2kins » Sun Jul 03, 2011 8:22 am
Is it B?
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by finance » Sun Jul 03, 2011 11:52 am
yes it is:)it's quite an easy one actually, but I still wanted to share.
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