81 is what percent of 781 - 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 781 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 781, so we can write it down as 100%=781.
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%=781
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%=781/81
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 781

100%/x%=781/81
(100/x)*x=(781/81)*x       - we multiply both sides of the equation by x
100=9.641975308642*x       - we divide both sides of the equation by (9.641975308642) to get x
100/9.641975308642=x
10.371318822023=x
x=10.371318822023

now we have:
81 is 10.371318822023% of 781