39 is what percent of 558 - 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 558 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 558, so we can write it down as 100%=558.
4. We know, that x% equals 39 of the output value, so we can write it down as x%=39.
5. Now we have two simple equations:
1) 100%=558
2) x%=39
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%=558/39
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 39 is what percent of 558

100%/x%=558/39
(100/x)*x=(558/39)*x       - we multiply both sides of the equation by x
100=14.307692307692*x       - we divide both sides of the equation by (14.307692307692) to get x
100/14.307692307692=x
6.989247311828=x
x=6.989247311828

now we have:
39 is 6.989247311828% of 558