21 is what percent of 35.5 - 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 35.5 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 35.5, so we can write it down as 100%=35.5.
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%=35.5
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%=35.5/21
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 35.5

100%/x%=35.5/21
(100/x)*x=(35.5/21)*x       - we multiply both sides of the equation by x
100=1.6904761904762*x       - we divide both sides of the equation by (1.6904761904762) to get x
100/1.6904761904762=x
59.154929577465=x
x=59.154929577465

now we have:
21 is 59.154929577465% of 35.5