20 is what percent of 555 - 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 555 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 555, so we can write it down as 100%=555.
4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.
5. Now we have two simple equations:
1) 100%=555
2) x%=20
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%=555/20
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20 is what percent of 555

100%/x%=555/20
(100/x)*x=(555/20)*x       - we multiply both sides of the equation by x
100=27.75*x       - we divide both sides of the equation by (27.75) to get x
100/27.75=x
3.6036036036036=x
x=3.6036036036036

now we have:
20 is 3.6036036036036% of 555