1. We assume, that the number 71 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 71 is 100%, so we can write it down as 71=100%.
4. We know, that x is 68% of the output value, so we can write it down as x=68%.
5. Now we have two simple equations:
1) 71=100%
2) x=68%
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: 71/x=100%/68%
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 68% of 71
71/x=100/68 (71/x)*x=(100/68)*x - we multiply both sides of the equation by x 71=1.4705882352941*x - we divide both sides of the equation by (1.4705882352941) to get x 71/1.4705882352941=x 48.28=x x=48.28