If 258 cars pass through an intersection in six hours, how many cars pass through the intersection every two hours?

86

Step-by-step explanation:

258/6=43

43x2=86

Step-by-step explanation:

Okay, so we know a number of students and the amount of girls as a bracket. So what we have to do now is multiply them with each other.

28 *4/7 = 16

So there are 16 girls in Mr. Chang´s class.

You can also determine the boys by - the students with the girls:

28-16=12 boys

Have a nice day :D