28 is what percent of 221 - 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 221 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 221, so we can write it down as 100%=221.
4. We know, that x% equals 28 of the output value, so we can write it down as x%=28.
5. Now we have two simple equations:
1) 100%=221
2) x%=28
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%=221/28
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 28 is what percent of 221

100%/x%=221/28
(100/x)*x=(221/28)*x       - we multiply both sides of the equation by x
100=7.8928571428571*x       - we divide both sides of the equation by (7.8928571428571) to get x
100/7.8928571428571=x
12.669683257919=x
x=12.669683257919

now we have:
28 is 12.669683257919% of 221