20 is what percent of 12.85 - 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 12.85 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 12.85, so we can write it down as 100%=12.85.
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%=12.85
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%=12.85/20
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 12.85

100%/x%=12.85/20
(100/x)*x=(12.85/20)*x       - we multiply both sides of the equation by x
100=0.6425*x       - we divide both sides of the equation by (0.6425) to get x
100/0.6425=x
155.6420233463=x
x=155.6420233463

now we have:
20 is 155.6420233463% of 12.85