9 is what percent of 638 - step by step solution

Simple and best practice solution for 9 is what percent of 638. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

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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 638 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 638, so we can write it down as 100%=638.
4. We know, that x% equals 9 of the output value, so we can write it down as x%=9.
5. Now we have two simple equations:
1) 100%=638
2) x%=9
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%=638/9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 9 is what percent of 638

100%/x%=638/9
(100/x)*x=(638/9)*x       - we multiply both sides of the equation by x
100=70.888888888889*x       - we divide both sides of the equation by (70.888888888889) to get x
100/70.888888888889=x
1.41065830721=x
x=1.41065830721

now we have:
9 is 1.41065830721% of 638

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