138.6 is what percent of 660 - 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 660 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 660, so we can write it down as 100%=660.
4. We know, that x% equals 138.6 of the output value, so we can write it down as x%=138.6.
5. Now we have two simple equations:
1) 100%=660
2) x%=138.6
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%=660/138.6
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 138.6 is what percent of 660

100%/x%=660/138.6
(100/x)*x=(660/138.6)*x       - we multiply both sides of the equation by x
100=4.7619047619*x       - we divide both sides of the equation by (4.7619047619) to get x
100/4.7619047619=x
21=x
x=21

now we have:
138.6 is 21% of 660

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