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Source: — Data Sufficiency |

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by niketdoshi123 » Sun Jul 29, 2012 3:35 am
smagish wrote:The answer is c
Sum of internal angles of a quadrilateral = 360
As shown in figure
(180 - w) + (180 - x) + (180 - y) + (180 - z) = 360
720 - w - x - y - z = 360
=> x+y = 360 - w -z
Hence we need both w & z to find the value of x+y

Hence C is correct
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quad.png