Whenever you see the word "IS," in a math problem, think EQUAL.

what percent of 20 is 30

what percent of 20 = 30

Since 30 is larger than 20, your percentage will be larger than 100%. (100% of 20 = 20)

You can turn this into a proportion (fraction), with 20 as your denominator (total # of something), and 30 as your numerator (# of parts of something). Right away, we can reduce by crossing out both zeros, which comes out to 3/2. You can either divide
it out by hand, or throw it into your calculator, which will result in 1.5.

You can also turn this into an algebraic equation (another skill set on your GED test that they'll be asking you about!).

what percent of 20 is 30

Make "what percent," your X, and substitute and equal sign for "is."

X of 20 = 30

"Of" = multiply

x20 = 30

In math, we always list the coefficient (number) before the x.

20x = 30

To simplify this, we divide 20 into 30. We end up with:

x = 30/20

Reduce it down (cross out both zeros, since we have one zero on top and one on the bottom- note that this ONLY works if there is an even number of zeros on top and bottom).

x = 3/2, or 1.5

The trick here is to turn 1.5 back into a percentage.

When we convert percentages into decimals, all we do is move the decimal over TWO places.

For example:

100% = 100.0%

Therefore,

100.0% = 1.000

(See what I did there? Just moved the decimal two places to the left. Nothing fancy at all. Really, it's that simple.)

To make 1.5 into a percentage, we need to move the decimal in the opposite direction (right).

1.5 = 150.0%

I'm leaving the decimal there to help illustrate the example, but if you have a decimal of (number).000, you can simply drop the decimal completely. ;-)

Hope that helps!