1. We assume, that the number 128 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 128 is 100%, so we can write it down as 128=100%.
4. We know, that x is 51% of the output value, so we can write it down as x=51%.
5. Now we have two simple equations:
1) 128=100%
2) x=51%
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:
128/x=100%/51%
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 51% of 128
128/x=100/51
(128/x)*x=(100/51)*x - we multiply both sides of the equation by x
128=1.96078431373*x - we divide both sides of the equation by (1.96078431373) to get x
128/1.96078431373=x
65.28=x
x=65.28
now we have:
51% of 128=65.28
