66 is what percent of 513 - 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 513 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 513, so we can write it down as 100%=513.
4. We know, that x% equals 66 of the output value, so we can write it down as x%=66.
5. Now we have two simple equations:
1) 100%=513
2) x%=66
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%=513/66
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 66 is what percent of 513

100%/x%=513/66
(100/x)*x=(513/66)*x       - we multiply both sides of the equation by x
100=7.77272727273*x       - we divide both sides of the equation by (7.77272727273) to get x
100/7.77272727273=x
12.865497076=x
x=12.865497076

now we have:
66 is 12.865497076% of 513