80 is what percent of 689 - 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 689 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 689, so we can write it down as 100%=689.
4. We know, that x% equals 80 of the output value, so we can write it down as x%=80.
5. Now we have two simple equations:
1) 100%=689
2) x%=80
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%=689/80
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 80 is what percent of 689

100%/x%=689/80
(100/x)*x=(689/80)*x       - we multiply both sides of the equation by x
100=8.6125*x       - we divide both sides of the equation by (8.6125) to get x
100/8.6125=x
11.611030478955=x
x=11.611030478955

now we have:
80 is 11.611030478955% of 689