If the equation x^2+ax+12=0 , x^2 +bx +...

If the equation `x^2+ax+12=0 , x^2 +bx +15 =0 and x^2 +(a+ b) x+ 36 =0` have a common positive root, then `b- 2a` is equal to

A

`-6`

B

22

C

6

D

`-22`

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The correct Answer is:

C

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