What is 90 percent of 31 - step by step solution

Simple and best practice solution for 90% of 31. 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 31 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 31 is 100%, so we can write it down as 31=100%.
4. We know, that x is 90% of the output value, so we can write it down as x=90%.
5. Now we have two simple equations:
1) 31=100%
2) x=90%
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:
31/x=100%/90%
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 90% of 31

31/x=100/90
(31/x)*x=(100/90)*x       - we multiply both sides of the equation by x
31=1.11111111111*x       - we divide both sides of the equation by (1.11111111111) to get x
31/1.11111111111=x
27.9=x
x=27.9

now we have:
90% of 31=27.9

 

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