91 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 91 of the output value, so we can write it down as x%=91.
5. Now we have two simple equations:
1) 100%=515
2) x%=91
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%=515/91
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 91 is what percent of 515

100%/x%=515/91
(100/x)*x=(515/91)*x       - we multiply both sides of the equation by x
100=5.6593406593407*x       - we divide both sides of the equation by (5.6593406593407) to get x
100/5.6593406593407=x
17.669902912621=x
x=17.669902912621

now we have:
91 is 17.669902912621% of 515