21.45 is what percent of 255 - 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 255 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 255, so we can write it down as 100%=255.
4. We know, that x% equals 21.45 of the output value, so we can write it down as x%=21.45.
5. Now we have two simple equations:
1) 100%=255
2) x%=21.45
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%=255/21.45
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.45 is what percent of 255

100%/x%=255/21.45
(100/x)*x=(255/21.45)*x       - we multiply both sides of the equation by x
100=11.888111888112*x       - we divide both sides of the equation by (11.888111888112) to get x
100/11.888111888112=x
8.4117647058824=x
x=8.4117647058824

now we have:
21.45 is 8.4117647058824% of 255