87 is what percent of 809 - 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 809 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 809, so we can write it down as 100%=809.
4. We know, that x% equals 87 of the output value, so we can write it down as x%=87.
5. Now we have two simple equations:
1) 100%=809
2) x%=87
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%=809/87
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 87 is what percent of 809

100%/x%=809/87
(100/x)*x=(809/87)*x       - we multiply both sides of the equation by x
100=9.2988505747126*x       - we divide both sides of the equation by (9.2988505747126) to get x
100/9.2988505747126=x
10.754017305315=x
x=10.754017305315

now we have:
87 is 10.754017305315% of 809