17.5 is what percent of 139 - 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 139 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 139, so we can write it down as 100%=139.
4. We know, that x% equals 17.5 of the output value, so we can write it down as x%=17.5.
5. Now we have two simple equations:
1) 100%=139
2) x%=17.5
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%=139/17.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 17.5 is what percent of 139

100%/x%=139/17.5
(100/x)*x=(139/17.5)*x       - we multiply both sides of the equation by x
100=7.9428571428571*x       - we divide both sides of the equation by (7.9428571428571) to get x
100/7.9428571428571=x
12.589928057554=x
x=12.589928057554

now we have:
17.5 is 12.589928057554% of 139