Final answer:
The correct answer is option b. The person has consumed 1/5 of the recommended daily water intake of 64 ounces by drinking 12.8 ounces after their morning exercise.
Step-by-step explanation:
To solve this problem, we need to calculate the total amount of water consumption recommended per day and compare it to the amount the person drank after their exercise session. The question states that the average person drinks 8 cups of water per day, with each cup being 8 ounces. Therefore, the total daily recommended water intake is 8 cups × 8 oz/cup = 64 ounces.
The person consumed 12.8 ounces of water after exercise. To find out what fraction this is of the daily average, we divide 12.8 ounces by the total daily intake of 64 ounces:
12.8 oz ÷ 64 oz = 0.2
The fraction 0.2 can also be written as 1/5, which is the answer to this question. Therefore, the person has consumed 1/5 of the daily average recommended amount of water after their morning exercise session.