Ronaldo wants to know how much water he uses when he takes a 10-minute shower. Would it be most appropriate to measure the amount of water in fluid ounces, cups, or gallons?
To answer this question, let’s think about measurement. Let’s start with the cup. Inside one cup, there would be eight fluid ounces. And do you know how many cups it takes to make a gallon? It takes 16 cups to make one gallon.
Here’s what we have: one fluid ounce, one cup, and one gallon. Showers are big and they use a lot of water. To measure a shower in fluid ounces or cups would be really inefficient. Because of the quantity of water that showers use, it’s best to use a larger measurement. In this case, it would be most appropriate to use gallons.