Use a percent model to calculate 15% of 20

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15 is what percent of 20 - Step By Step Solution:

To get the solution, we are looking for, we need to point out what we know. 

1. We assume, that the number 20 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for. 

3. If 100% equals 20, so we can write it down as 100%=20. 

4. We know, that x% equals 15 of the output value, so we can write it down as x%=15. 

5. Now we have two simple equations:

1) 100%=20
2) x%=15

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

100%/x%=20/15

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 15 is what percent of 20

100%/x%=20/15
(100/x)*x=(20/15)*x       - we multiply both sides of the equation by x
100=1.33333333333*x       - we divide both sides of the equation by (1.33333333333) to get x
100/1.33333333333=x 
75=x 
x=75

Now we have: 
15 is 75% of 20

^^^^^The Answer^^^^^

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