The highest proof alcohol is about 180 proof or 90% alcohol.
2.8 percent alcohol
Because the concentration of alcohol is lower; you pay the alcohol not the water.
This is a solution containg 60 percent isopropyl alcohol; can be used as rubbing alcohol.
There is no way to calculate that with the information provided. We need to know the volume of each.
Add 5% water
The Hair of the Dog Dave has the highest alcohol content which is 29% ABV.
2/3 of 70% and 1/3 of 10%
According to the National Highway Traffic Safety Administration (NHTSA) statistics report in 2008, 11, 773 of the 37,261 people who were killed in traffic accidents are alcohol-related. In 2008, 35 percent of fatally injured passenger vehicle drivers had BACs at or above 0.08 percent. Pedestrians had the highest proportion of BACs at or above 0.08 percent (38 percent).
Alcohol test ( proof ) is the percent of alcohol in drinks.
The highest level spirit it is possible to brew at all is only around 96.5%. At this point the water-alcohol solution becomes azeotropic, meaning that distillation can't separate them further.
A bottle will usually state it's alcohol by volume (ABV) as "proof" . Proof is double what the percentage of alcohol is. So, a bottle of 60 proof spirits would be 30% alcohol by volume. The highest percentage alcohol in a spirit that I've seen is 151 proof, and that was a bottle of rum.