Question

1) What is 20% of 20?
2) what is 15 is what percent of 30?
3) 50 is 50% of what?

Answer 1

Hi there!

The word "of" is the same thing as a multiplication sign.

1)

20% = 0.2

0.2 × 20 = 4

2)

? × 30 = 15

divide each side of the equation by 30

? = 0.5

0.5 = 50%

3)

50% = 0.5

0.5 × ? = 50

divide each side of the equation by 0.5

? = 100

There you go! I really hope this helped, if there's anything just let me know! :)

Answer 2

QUESTION 1

What is 20% of 20?

To find the percent of a number, you have to change the percent into a decimal or a fraction and multiply by the number.

DECIMAL:

To change a percent into a decimal, remove the percent sign and move the decimal point 2 places to the left.

`20 \% \rightarrow 0.2`

Now that you have your decimal, multiply by 20:

`0.2 * 20 = 4`

ANSWER = 4

FRACTION:

To change a percent into a fraction, make the percent number as the numerator(top number) and 100 as the denominator(bottom number) since fractions are out of 100.

`20 \% \rightarrow (20)/(100)`

Now that you have your fraction, multiply by 20:

`(20)/(100) * 20 = (400)/(100) = 4`

ANSWER = 4

QUESTION 2

15 is what percent of 30?

For questions like these, you have to divide. In this question, you have to divide 15 by 30 and change that into a percent.

First divide:

`15 / 30 = 0.5`

Now you need to change the decimal into a fraction.

To change a decimal into a percent, you have to add a percent sign and move the decimal point 2 places to the right.

`0.5 \rightarrow 50 \%`

ANSWER = 50%

QUESTION 3

50 is 50% of what?

For this question, you can make an equation.

`50 = 50 \% * x`

To make it easier, change 50% to a decimal:

`50 \% = 0.5`

Here is your new equation:

`0.5 * x = 50`

x is your answer. To find your answer, you have to divide both sides by 0.5 to leave x alone. Divide:

`0.5 * x / 0.5 = 50 / 0.5 \\ x = 50 / 0.5 \\ x = 100`

ANSWER = 100

If you have any questions, feel free to ask in the comments! :)