SOLUTION: complete the series B+5,D-10, I+15?

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Question 1015133: complete the series B+5,D-10, I+15?
Answer by fractalier(6550)   (Show Source): You can put this solution on YOUR website!
Well I'm thinking B=2, D=4, and I=9, so the next letter could be 17=Q...the next number is -20, so I'm thinking the answer is
Q-20

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