83 is what percent of 640 - 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 640 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 640, so we can write it down as 100%=640.
4. We know, that x% equals 83 of the output value, so we can write it down as x%=83.
5. Now we have two simple equations:
1) 100%=640
2) x%=83
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%=640/83
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 83 is what percent of 640

100%/x%=640/83
(100/x)*x=(640/83)*x       - we multiply both sides of the equation by x
100=7.71084337349*x       - we divide both sides of the equation by (7.71084337349) to get x
100/7.71084337349=x
12.96875=x
x=12.96875

now we have:
83 is 12.96875% of 640

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