If x ( x + y + z) = 20 , y ( x + y + z)...

If `x ( x + y + z) = 20 , y ( x + y + z) = 30 and z ( x + y + z) = 50 ` the vaue of 2 (x + y + z) is

A

`-10`

B

15

C

18

D

20

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The correct Answer is:

D

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