Can someone please answer some of my questions?
*They are all math

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?