My question is: A bottle can hold 2 cups of water. How many cups of water are needed to fill up 10 whole bottles and 5 half-capacity bottles? Your thoughts:
For 10 whole bottles, you will need 10 * 2 = 20 cups of water. With 5 half - capacity bottles, it requires 5 * 1 = 5 cups of water. In total, you need to have 25 + 5 = 30 cups of water to fill them all. The final answer: 30.