Amount of Alcholic Beverage #1 (mL): initial_volume 
Concentration (%): initial_concentration
Alcohol in Beverage #1 (mL): target_alcohol_volume: initial_volume*initial_concentration/100

Concentration of Alcoholic Beverage #2 (%): target_concentration
Equivalent Volume of Beverage #2 (mL): : target_alcohol_volume/target_concentration*100