This question requires us to find the volume of the swimming pool. We will assume that the shape of the pool is rectangular with a constant depth throughout, resulting in a rectangular prism overall. The volume of a rectangular prism is simply the product of the length, width and depth of the pool.
V = l·w·d
We are told the length is 50 m and the width is 25 m. However, we are told the depth is 7.6 ft. Therefore, we must convert these units to m in order to find the volume properly.
7.6 ft x 0.3048 m/ft = 2.316 m
V = (50 m)(25 m)(2.316 m)
V = 2895.6 m³
The density of the pool is 1g/mL. We need to convert mL to m³ in order to use the volume we calculated.
1 mL = 1 cm³
1000000 cm³ = 1 m³
1 g/mL x 1 mL/1 cm³ = 1 g/cm³
1 g/cm³ x 1000000 cm³/m³ = 1000000 g/m³
1000000 g/m³ x 2895.6 m³ = 2.9 x 10⁹ = 2.9E9 g
There are 2.9E9 grams of water in the pool.
