87 is what percent of 511 - 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 511 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 511, so we can write it down as 100%=511.
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%=511
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%=511/87
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 511

100%/x%=511/87
(100/x)*x=(511/87)*x       - we multiply both sides of the equation by x
100=5.8735632183908*x       - we divide both sides of the equation by (5.8735632183908) to get x
100/5.8735632183908=x
17.025440313112=x
x=17.025440313112

now we have:
87 is 17.025440313112% of 511