How much water does a swimming pool 20 meters long, 5 meters wide, and 3meters deep hold?

1. Calculate the volume of the swimming pool using the formula for the volume of a rectangular prism:

V = \text{length} \times \text{width} \times \text{depth}

2. Substitute the given values into the formula:

V = 20 \, \text{m} \times 5 \, \text{m} \times 3 \, \text{m}

3. Perform the multiplication:

V = 20 \times 5 \times 3 = 300 \, \text{cubic meters}

Answer: 300 \, \text{cubic meters}