I'm organizing a bourbon tasting for next week. I've pretty much settled on a selection of 10 year olds from different distilleries and I want to include the Van Winkle 10yr. 107 in the mix. As the others are all 100 proof with the exception of WTRR at 101, my question is whether, for the sake of fairness, I should bring the 107 down to 100 proof or just leave it as is? We're tasting blind.

Also, as I am mathematically challenged, if anyone could provide me with the formula to get me to the lower proof, I'd be greatful.