42 is what percent of 321.5 - 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 321.5 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 321.5, so we can write it down as 100%=321.5.
4. We know, that x% equals 42 of the output value, so we can write it down as x%=42.
5. Now we have two simple equations:
1) 100%=321.5
2) x%=42
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%=321.5/42
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 42 is what percent of 321.5

100%/x%=321.5/42
(100/x)*x=(321.5/42)*x       - we multiply both sides of the equation by x
100=7.6547619047619*x       - we divide both sides of the equation by (7.6547619047619) to get x
100/7.6547619047619=x
13.063763608087=x
x=13.063763608087

now we have:
42 is 13.063763608087% of 321.5