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What percent of 75 is 15?

 Oct 10, 2017
 #1
avatar+114 
+2

What percent of 75 is 15?

 

Translates to:

\(75\,*\,x\,=15\\ x\%=\frac{15}{75}\\ x=0.2\\ 0.2 = 20\% \)

 

 

Tips:

I'll use the same numbers for each example. 

Three variants

 

What percent of 100 is 40?

oldnum * {percent} = newnum

(What percent of the original number [100] gives you the new number [40]?)

100 * ? = 40

? = 40/100

? = 0.4

0.4 --> 40%

 

What is 40% of 100?

oldnum * percent = {newnum}

([40] percent of the original number [100] results in what number?)

100 * 40% = ?

40% --> 0.4

100 * 0.4 = 40

 

40% of what is 40?

{oldnum} * percent = newnum

([40] percent of what number gives you the new number [40])?

? * 40% = 40 

40% --> 0.4

? * 0.4 = 40

? = 40/0.4

? = 100

 

*this was hard for me at first, but with practice, you'll get used to the wording of the questions

.
 Oct 10, 2017
edited by ChowMein  Oct 10, 2017
edited by ChowMein  Oct 10, 2017
 #2
avatar+99282 
+1

If you are an honours student and you do not already know how to find the percentage of a number then I think you need to drop down several levels and study introductory arithmetic instead.  

 

15/75  *  100% = 20%

 Oct 10, 2017

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