What is 17.5 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 20 is 100%, so we can write it down as 20=100%.
4. We know, that x is 17.5% of the output value, so we can write it down as x=17.5%.
5. Now we have two simple equations:
1) 20=100%
2) x=17.5%
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:
20/x=100%/17.5%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 17.5% of 20

20/x=100/17.5
(20/x)*x=(100/17.5)*x       - we multiply both sides of the equation by x
20=5.7142857142857*x       - we divide both sides of the equation by (5.7142857142857) to get x
20/5.7142857142857=x
3.5=x
x=3.5

now we have:
17.5% of 20=3.5