Question

In order to fill his fish tank to capacity Jamal needs to put 25 gallons of water into the tank. If Jamal has 12.5% of the tank filled with water, how much more water does he need to put into the tank

Answer 1

100% (full) - 12.5% = 87.5% more needed.

25gallons x 87.5% = 21.875 gallons

Answer: 21.875 gallons

Answer 2

Answer: 21.875 gallons

To Know:

Keep in mind a percent divided by 100 becomes a decimal.

There are two ways to solve this problem.

The first is to find how much water is in the fish tank already:

     We can set up a proportion to solve. This proportion has units of percentage on the top and gallons on the bottom.

     It will help us to find how much water is in the fish tank:

$\frac{1}{25} =\frac{0.125}{x}$

1x = 3.125

x = 3.125

     Now we can solve for how much water is needed to fill the tank:

25 - 3.125 = 21.875 gallons

The second is to find how much is needed using the percentages:

100% - 12.5% = 87.5%

Now to find how much is needed:

25 * 0.875 = 21.875 gallons

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather