18 is what percent of 39.6 - 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 39.6 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 39.6, so we can write it down as 100%=39.6.
4. We know, that x% equals 18 of the output value, so we can write it down as x%=18.
5. Now we have two simple equations:
1) 100%=39.6
2) x%=18
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%=39.6/18
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 18 is what percent of 39.6

100%/x%=39.6/18
(100/x)*x=(39.6/18)*x       - we multiply both sides of the equation by x
100=2.2*x       - we divide both sides of the equation by (2.2) to get x
100/2.2=x
45.454545454545=x
x=45.454545454545

now we have:
18 is 45.454545454545% of 39.6