What is 73.5 percent of 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 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 21 is 100%, so we can write it down as 21=100%.
4. We know, that x is 73.5% of the output value, so we can write it down as x=73.5%.
5. Now we have two simple equations:
1) 21=100%
2) x=73.5%
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:
21/x=100%/73.5%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 73.5% of 21

21/x=100/73.5
(21/x)*x=(100/73.5)*x       - we multiply both sides of the equation by x
21=1.3605442176871*x       - we divide both sides of the equation by (1.3605442176871) to get x
21/1.3605442176871=x
15.435=x
x=15.435

now we have:
73.5% of 21=15.435