20 is what percent of 7.21 - 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 7.21 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 7.21, so we can write it down as 100%=7.21.
4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.
5. Now we have two simple equations:
1) 100%=7.21
2) x%=20
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%=7.21/20
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20 is what percent of 7.21

100%/x%=7.21/20
(100/x)*x=(7.21/20)*x       - we multiply both sides of the equation by x
100=0.3605*x       - we divide both sides of the equation by (0.3605) to get x
100/0.3605=x
277.39251040222=x
x=277.39251040222

now we have:
20 is 277.39251040222% of 7.21