simple math question?

translation

x/100 * 15= 75

x/100 = 75/15= 5

x = 500

Hello! I am a librarian and am glad to help with your math question.

There are a few good resources for math problems like this one. One is "Math is Fun" and they provide a percentage calculator.

If you ask for what the percent of 15 is 75, it gives you the answer (20%) but also why this works.

http://www.mathsisfun.com/percentage-calculator.ht...

Use the "compare" field to compare 75 to 15 and see what comes up. I see "15 is 20% of 75" - and why? Because:

Because:

As a fraction, 15/75 = 0.2

As a percentage it is: (15/75) x 100 = 20%

Another resource called "Big Ideas Math" on page 2, Activity #3, you'll see this answer too but it's given in a visual way on a graph. Sometimes that helps make more sense:

http://www.bigideasmath.com/protected/content/ipe/...

Hope this works for you! Your public library may also have a tutoring program that is offered free and online to help work on such problems with friendly experts; ask about that at your library when you get a chance.

Thanks for asking!

20%

15/75 = 3/15 = 1/5 = 20/100

75/15 equals 5.

Times 100 percent

500% is right

rx15=75

15r=75

15r/15=75/15

r=5

x100 b/c thats how you get %

Maybe this site can help you:

http://www.purplemath.com/modules/percntof.htm