20 is what percent of 251.3 - 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 251.3 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 251.3, so we can write it down as 100%=251.3.
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%=251.3
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%=251.3/20
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 251.3

100%/x%=251.3/20
(100/x)*x=(251.3/20)*x       - we multiply both sides of the equation by x
100=12.565*x       - we divide both sides of the equation by (12.565) to get x
100/12.565=x
7.958615200955=x
x=7.958615200955

now we have:
20 is 7.958615200955% of 251.3