20 is what percent of 140 - 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 140 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 140, so we can write it down as 100%=140.
4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.
5. Now we have two simple equations:
1) 100%=140
2) x%=20
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%=140/20
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20 is what percent of 140

100%/x%=140/20
(100/x)*x=(140/20)*x       - we multiply both sides of the equation by x
100=7*x       - we divide both sides of the equation by (7) to get x
100/7=x
14.2857142857=x
x=14.2857142857

now we have:
20 is 14.2857142857% of 140

 

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