A swimming pool had 2.5 million liters of water in it. some water evaporates, and then the pool only had 2 million liters of water in it. what persent of water evaporated?

First, determine the amount of water that evaporated by subtracting the final volume of water in the pool from the initial volume. That is,

V, evaporated = 2.5 million liters - 2 million liters

V, evaporated = 0.5 million liters

Then, to determine the percentage of water evaporated, we divided the amount of water evaporated by the original amount and multiply the quotient by 100%.

P = (0.5 million liters) / (2.5 million liters) x 100%

P = 20%

Answer: 20%

The initial amount of water was 2.5 million liters

Then 2 million liters remained after evaporation, therefore 0.5 liters evaporated from the swimming pool.

Thus, the percentage will be given by: 0.5/2.5 * 100 = 20%

Hence the answer is 20%