What is 20 percent of 9 - step by step solution

Simple and best practice solution for 20% of 9. 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 9 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 9 is 100%, so we can write it down as 9=100%.
4. We know, that x is 20% of the output value, so we can write it down as x=20%.
5. Now we have two simple equations:
1) 9=100%
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:
9/x=100%/20%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 20% of 9

9/x=100/20
(9/x)*x=(100/20)*x       - we multiply both sides of the equation by x
9=5*x       - we divide both sides of the equation by (5) to get x
9/5=x
1.8=x
x=1.8

now we have:
20% of 9=1.8

 

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