90 is what percent of 557 - 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 557 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 557, so we can write it down as 100%=557.
4. We know, that x% equals 90 of the output value, so we can write it down as x%=90.
5. Now we have two simple equations:
1) 100%=557
2) x%=90
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%=557/90
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 90 is what percent of 557

100%/x%=557/90
(100/x)*x=(557/90)*x       - we multiply both sides of the equation by x
100=6.1888888888889*x       - we divide both sides of the equation by (6.1888888888889) to get x
100/6.1888888888889=x
16.157989228007=x
x=16.157989228007

now we have:
90 is 16.157989228007% of 557