13.13 is what percent of 90 - 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 90 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 90, so we can write it down as 100%=90.
4. We know, that x% equals 13.13 of the output value, so we can write it down as x%=13.13.
5. Now we have two simple equations:
1) 100%=90
2) x%=13.13
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%=90/13.13
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 13.13 is what percent of 90

100%/x%=90/13.13
(100/x)*x=(90/13.13)*x       - we multiply both sides of the equation by x
100=6.8545316070069*x       - we divide both sides of the equation by (6.8545316070069) to get x
100/6.8545316070069=x
14.588888888889=x
x=14.588888888889

now we have:
13.13 is 14.588888888889% of 90