What is 80 percent of 15 - step by step solution

Simple and best practice solution for 80% of 15. 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 15 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 15 is 100%, so we can write it down as 15=100%.
4. We know, that x is 80% of the output value, so we can write it down as x=80%.
5. Now we have two simple equations:
1) 15=100%
2) x=80%
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:
15/x=100%/80%
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 80% of 15

15/x=100/80
(15/x)*x=(100/80)*x       - we multiply both sides of the equation by x
15=1.25*x       - we divide both sides of the equation by (1.25) to get x
15/1.25=x
12=x
x=12

now we have:
80% of 15=12

 

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