21 is what percent of 109 - step by step solution

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To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 109 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 109, so we can write it down as 100%=109.
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%=109
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%=109/21
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 109

100%/x%=109/21
(100/x)*x=(109/21)*x - we multiply both sides of the equation by x
100=5.2*x - we divide both sides of the equation by (5.2) to get x
100/5.2=x
19.=x
x=19.

now we have:
21 is 19.% of 109

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