21 is what percent of 1943 - 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 1943 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 1943, so we can write it down as 100%=1943.
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%=1943
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%=1943/21
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 1943

100%/x%=1943/21
(100/x)*x=(1943/21)*x       - we multiply both sides of the equation by x
100=92.52380952381*x       - we divide both sides of the equation by (92.52380952381) to get x
100/92.52380952381=x
1.080802882141=x
x=1.080802882141

now we have:
21 is 1.080802882141% of 1943

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