21 is what percent of 120.6 - 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 120.6 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 120.6, so we can write it down as 100%=120.6.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=120.6
2) x%=21
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%=120.6/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21 is what percent of 120.6

100%/x%=120.6/21
(100/x)*x=(120.6/21)*x       - we multiply both sides of the equation by x
100=5.7428571428571*x       - we divide both sides of the equation by (5.7428571428571) to get x
100/5.7428571428571=x
17.412935323383=x
x=17.412935323383

now we have:
21 is 17.412935323383% of 120.6