A swimming pool has 2.5 million liters of water in it and some evaporates and now there's only 2 million liters left. what % evaporated

Answer 1

To answer this question, you must first find out the difference of the water in the pool from before it evaporates to after it evaporates. 2.5 million liters - 2.0 liters will give you .5 liters. That is how much water you lost from the pool. Now you can set up a proportion to find out your percentage. We don't know the percentage evaporated so we will let x represent the amount evaporated. Since it is a percentage we know it is out of 100%. X is the part and 100 is the whole. The same is true with .5 million liters being the part and 2.5 million liters being the whole. Your equation will look like this:

x .5

– = –

100 2.5

When you cross multiply you get:

2.5 X x = 100 X .5

2.5x = 50 Then divide both sides by 2.5 to get x by itself

— —

2.5 2.5

x = 20 Your answer is 20%

Answer 2

So a swimming pool starts with 2.5million liters of water and loses .5million.

2.5-.5=2million liters left

So this question is asking us what percent evaporated, thus .5million being the percent in question

There are a couple different ways to solve for this kind of problem, but the first thing I would do is divide our starting 100%, AKA 2.5million by what we lost, .5million

And we can actually simplify this equation further by implying the million aspect of this and just using the numbers to divide.

So 2.5/.5 = 5

So that means that this swimming pool is made up of 5 equal parts of .5million liters of water

So now we take our full swimming pool, which is 100% and we divide by 5 because we know that the swimming pool is made up of 5 equal parts of .5million liters, and we lost one of those parts.

So, 100/5 =20

=20%

So those 5 equal parts all each represent 20% of our swimming pool meaning that the .5million liters of water that evaporated is equal to 20% of the total pool volume.

We can double check this work by taking our original .5million liters that evaporated and multiplying that by 5

.5x5 = 2.5!!!

Now that we have double checked our work, we can confidently say that the lost .5million liters of water accounts for 20% of the swimming pool