3.9 is what percent of 42.9 - 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 42.9 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 100% equals 42.9, so we can write it down as 100%=42.9.
4. We know, that x% equals 3.9 of the output value, so we can write it down as x%=3.9.
5. Now we have two simple equations:
1) 100%=42.9
2) x%=3.9
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:
100%/x%=42.9/3.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 3.9 is what percent of 42.9

100%/x%=42.9/3.9
(100/x)*x=(42.9/3.9)*x       - we multiply both sides of the equation by x
100=11*x       - we divide both sides of the equation by (11) to get x
100/11=x
9.0909090909091=x
x=9.0909090909091

now we have:
3.9 is 9.0909090909091% of 42.9