28 is what percent of 515 - 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 515 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 515, so we can write it down as 100%=515.
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%=515
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%=515/28
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 515

100%/x%=515/28
(100/x)*x=(515/28)*x       - we multiply both sides of the equation by x
100=18.392857142857*x       - we divide both sides of the equation by (18.392857142857) to get x
100/18.392857142857=x
5.4368932038835=x
x=5.4368932038835

now we have:
28 is 5.4368932038835% of 515