The stadium has 9400 seats. 7990 of these seats are in the sun today. What percent of seats are NOT In the sun?

15%

Step-by-step explanation:

We assume, that the number 9400 is 100% - because it's the output value of the task.

x is the value we are looking for.

If 100% equals 9400, so we can write it down as 100%=9400.

We know, that x% equals 7990 of the output value, so we can write it down as x%=7990.

Now we have two simple equations:

100%=9400

x%=7990

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%=9400/7990

Now we just have to solve the simple equation, and we will get the solution we are looking for.

Solution for 7990 is what percent of 9400.