Answer:
20%
Explanation:
To find the percent of water that evaporated, we can calculate the difference between the initial amount of water and the remaining amount of water and then divide that difference by the initial amount of water and multiply by 100 to get the percentage.
The difference between the initial amount of water (2.5 million liters) and the remaining amount (2 million liters) is 0.5 million liters.
So, the percentage of water that evaporated is:
(0.5 million liters / 2.5 million liters) * 100 = 20%.
Therefore, 20% of the water evaporated.