To answer your question, let's first break it down step by step:

1. 1 cup = 8 fluid ounces.
2. You're asking about the total volume for 3 plastic cups.

If each cup holds 1 cup (or 8 fluid ounces) of water, then for 3 cups, the total volume would be:

$3 \, \text{cups} \times 8 \, \text{fluid ounces per cup} = 24 \, \text{fluid ounces}.$

Thus, yes, it would take 24 fluid ounces of water to fill three plastic cups if each holds 8 fluid ounces.

Would you like further clarification on this?

Related Questions:

1. How many fluid ounces are in a gallon?
2. What is the conversion between cups and liters?
3. How do you convert fluid ounces to milliliters?
4. How much water does a standard-sized bottle hold in fluid ounces?
5. What is the weight of water in ounces for 1 fluid ounce?

Tip: Always double-check the capacity of containers, as "plastic cups" can vary in size.