21.5 is what percent of 316.5 - 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 316.5 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 316.5, so we can write it down as 100%=316.5.
4. We know, that x% equals 21.5 of the output value, so we can write it down as x%=21.5.
5. Now we have two simple equations:
1) 100%=316.5
2) x%=21.5
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%=316.5/21.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.5 is what percent of 316.5

100%/x%=316.5/21.5
(100/x)*x=(316.5/21.5)*x       - we multiply both sides of the equation by x
100=14.720930232558*x       - we divide both sides of the equation by (14.720930232558) to get x
100/14.720930232558=x
6.7930489731438=x
x=6.7930489731438

now we have:
21.5 is 6.7930489731438% of 316.5