1686.4 is what percent of 9920 - 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 9920 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 9920, so we can write it down as 100%=9920.
4. We know, that x% equals 1686.4 of the output value, so we can write it down as x%=1686.4.
5. Now we have two simple equations:
1) 100%=9920
2) x%=1686.4
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%=9920/1686.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 1686.4 is what percent of 9920

100%/x%=9920/1686.4
(100/x)*x=(9920/1686.4)*x       - we multiply both sides of the equation by x
100=5.8823529411765*x       - we divide both sides of the equation by (5.8823529411765) to get x
100/5.8823529411765=x
17=x
x=17

now we have:
1686.4 is 17% of 9920