21 is what percent of 12828 - 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 12828 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 12828, so we can write it down as 100%=12828.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=12828
2) x%=21
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%=12828/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21 is what percent of 12828

100%/x%=12828/21
(100/x)*x=(12828/21)*x       - we multiply both sides of the equation by x
100=610.85714285714*x       - we divide both sides of the equation by (610.85714285714) to get x
100/610.85714285714=x
0.16370439663237=x
x=0.16370439663237

now we have:
21 is 0.16370439663237% of 12828