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No, ERA+ is screwy so 50 is not the reciprocal of 150. You would need an ERA+ of 75 to cancel out 150. Furthermore, the 2009 M's had a good or great defense so they had an ERA+ of 112, not 100 so the rest of the staff would just need and ERA+ of around 85 or 90 in this instance to cancel out the top 4 starters.