21.1 is what percent of 72 - 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 72 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 72, so we can write it down as 100%=72.
4. We know, that x% equals 21.1 of the output value, so we can write it down as x%=21.1.
5. Now we have two simple equations:
1) 100%=72
2) x%=21.1
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%=72/21.1
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21.1 is what percent of 72

100%/x%=72/21.1
(100/x)*x=(72/21.1)*x       - we multiply both sides of the equation by x
100=3.4123222748815*x       - we divide both sides of the equation by (3.4123222748815) to get x
100/3.4123222748815=x
29.305555555556=x
x=29.305555555556

now we have:
21.1 is 29.305555555556% of 72