What is 87.1 percent of 159 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 159 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 159 is 100%, so we can write it down as 159=100%.
4. We know, that x is 87.1% of the output value, so we can write it down as x=87.1%.
5. Now we have two simple equations:
1) 159=100%
2) x=87.1%
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:
159/x=100%/87.1%
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 87.1% of 159

159/x=100/87.1
(159/x)*x=(100/87.1)*x       - we multiply both sides of the equation by x
159=1.1481056257176*x       - we divide both sides of the equation by (1.1481056257176) to get x
159/1.1481056257176=x
138.489=x
x=138.489

now we have:
87.1% of 159=138.489