87 is what percent of 831 - 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 831 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 831, so we can write it down as 100%=831.
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%=831
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%=831/87
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 831

100%/x%=831/87
(100/x)*x=(831/87)*x       - we multiply both sides of the equation by x
100=9.551724137931*x       - we divide both sides of the equation by (9.551724137931) to get x
100/9.551724137931=x
10.469314079422=x
x=10.469314079422

now we have:
87 is 10.469314079422% of 831