What is 31.2 percent of 18 - 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 18 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 18 is 100%, so we can write it down as 18=100%.
4. We know, that x is 31.2% of the output value, so we can write it down as x=31.2%.
5. Now we have two simple equations:
1) 18=100%
2) x=31.2%
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:
18/x=100%/31.2%
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 31.2% of 18

18/x=100/31.2
(18/x)*x=(100/31.2)*x       - we multiply both sides of the equation by x
18=3.2051282051282*x       - we divide both sides of the equation by (3.2051282051282) to get x
18/3.2051282051282=x
5.616=x
x=5.616

now we have:
31.2% of 18=5.616