What is 21.2 percent of 31 - 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 31 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 31 is 100%, so we can write it down as 31=100%.
4. We know, that x is 21.2% of the output value, so we can write it down as x=21.2%.
5. Now we have two simple equations:
1) 31=100%
2) x=21.2%
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:
31/x=100%/21.2%
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 21.2% of 31

31/x=100/21.2
(31/x)*x=(100/21.2)*x       - we multiply both sides of the equation by x
31=4.7169811320755*x       - we divide both sides of the equation by (4.7169811320755) to get x
31/4.7169811320755=x
6.572=x
x=6.572

now we have:
21.2% of 31=6.572