20.9 is what percent of 19 - 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 19 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 19, so we can write it down as 100%=19.
4. We know, that x% equals 20.9 of the output value, so we can write it down as x%=20.9.
5. Now we have two simple equations:
1) 100%=19
2) x%=20.9
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%=19/20.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20.9 is what percent of 19

100%/x%=19/20.9
(100/x)*x=(19/20.9)*x       - we multiply both sides of the equation by x
100=0.90909090909091*x       - we divide both sides of the equation by (0.90909090909091) to get x
100/0.90909090909091=x
110=x
x=110

now we have:
20.9 is 110% of 19