GRE Math : How to find fractional percentages

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #1 : Percentage

What percentage of a solution is blood if it contains ml blood and ml water?  Round to the nearest thousandth?

Possible Answers:

Correct answer:


First, you must find the total amount of solution.  This is , or .  

Now, the percentage of the solution that is blood can be represented:

, or 

This is the same as %  Rounded, it is %

Example Question #2 : Percentage

What is the percentage increase of an account that began with a balance of  and increased to ?

Possible Answers:

Correct answer:


Recall that the formula for percentage increase is:

, where  is your ending value and  is your starting value.

For our numbers, this would be:

Recall that to find a percentage from a decimal, you multiply by :

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