21 is what percent of 2644 - 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 2644 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 2644, so we can write it down as 100%=2644.
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%=2644
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%=2644/21
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 2644

100%/x%=2644/21
(100/x)*x=(2644/21)*x       - we multiply both sides of the equation by x
100=125.90476190476*x       - we divide both sides of the equation by (125.90476190476) to get x
100/125.90476190476=x
0.79425113464448=x
x=0.79425113464448

now we have:
21 is 0.79425113464448% of 2644