81 is what percent of 2509 - 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 2509 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 2509, so we can write it down as 100%=2509.
4. We know, that x% equals 81 of the output value, so we can write it down as x%=81.
5. Now we have two simple equations:
1) 100%=2509
2) x%=81
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%=2509/81
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 81 is what percent of 2509

100%/x%=2509/81
(100/x)*x=(2509/81)*x       - we multiply both sides of the equation by x
100=30.975308641975*x       - we divide both sides of the equation by (30.975308641975) to get x
100/30.975308641975=x
3.2283778397768=x
x=3.2283778397768

now we have:
81 is 3.2283778397768% of 2509