Final answer:
Each drain plug would drain 1/6 of the total volume of water in the swimming pool.
Step-by-step explanation:
To find out how much water is drained from each plug, we need to divide the total volume of water drained by the number of plugs. Since 1/2 of the volume of water in the pool is drained equally from 3 drain plugs, each drain plug would drain 1/3 of the total volume drained. This means that 1/6 of the total volume of water in the pool is drained from each plug.