Final answer:
Meredith consumed 709 milliliters of alcohol.
Step-by-step explanation:
To calculate the amount of alcohol Meredith consumed, we need to convert the volumes from ounces to milliliters.
There are approximately 29.5735 milliliters in 1 fluid ounce. So, 6 ounces is equal to 177 milliliters, and 12 ounces is equal to 355 milliliters.
In total, Meredith consumed 2 cocktails, each containing 177 milliliters, which is a total of 354 milliliters. She also had a 12-ounce beer, which is 355 milliliters.
So, the total amount of alcohol Meredith consumed is 354 milliliters + 355 milliliters = 709 milliliters.