What is 31.6 percent of 21 - 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 21 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 21 is 100%, so we can write it down as 21=100%.
4. We know, that x is 31.6% of the output value, so we can write it down as x=31.6%.
5. Now we have two simple equations:
1) 21=100%
2) x=31.6%
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:
21/x=100%/31.6%
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 31.6% of 21

21/x=100/31.6
(21/x)*x=(100/31.6)*x       - we multiply both sides of the equation by x
21=3.1645569620253*x       - we divide both sides of the equation by (3.1645569620253) to get x
21/3.1645569620253=x
6.636=x
x=6.636

now we have:
31.6% of 21=6.636