5 is what percent of 39.9 - 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 39.9 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 39.9, so we can write it down as 100%=39.9.
4. We know, that x% equals 5 of the output value, so we can write it down as x%=5.
5. Now we have two simple equations:
1) 100%=39.9
2) x%=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%=39.9/5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 5 is what percent of 39.9

100%/x%=39.9/5
(100/x)*x=(39.9/5)*x       - we multiply both sides of the equation by x
100=7.98*x       - we divide both sides of the equation by (7.98) to get x
100/7.98=x
12.531328320802=x
x=12.531328320802

now we have:
5 is 12.531328320802% of 39.9