Answer:
3.81
Step-by-step explanation:
1. We assume, that the number 25.4 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 25.4 is 100%, so we can write it down as 25.4=100%.
4. We know, that x is 15% of the output value, so we can write it down as x=15%.
5. Now we have two simple equations:
1) 25.4=100%
2) x=15%
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:
25.4/x=100%/15%
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 15% of 25.4
25.4/x=100/15
(25.4/x)*x=(100/15)*x - we multiply both sides of the equation by x
25.4=6.66666666667*x - we divide both sides of the equation by (6.66666666667) to get x
25.4/6.66666666667=x
3.81=x
x=3.81
