21 is what percent of 155.29 - 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 155.29 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 155.29, so we can write it down as 100%=155.29.
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%=155.29
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%=155.29/21
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 155.29

100%/x%=155.29/21
(100/x)*x=(155.29/21)*x       - we multiply both sides of the equation by x
100=7.3947619047619*x       - we divide both sides of the equation by (7.3947619047619) to get x
100/7.3947619047619=x
13.523085839397=x
x=13.523085839397

now we have:
21 is 13.523085839397% of 155.29