Need Help! Would like To know How to solve these..... Would like to know step by step(formula)

Numerical Skills/Prealgebra

6. Four students about to purchase concert tickets for $18.50 for each ticket discover that they may purchase a block of 5 tickets for $80.00. How much would each of the 4 save if they can get a fifth person to join them and the 5 people equally divide the price of the 5-ticket block?

A. $ 1.50

B. $ 2.50

C. $ 3.13

D. $10.00

E. $12.50

8. Saying that 4 < x < 9 is equivalent to saying what about x ?

A. 0 < x < 5

B. 0 < x < 65

C. 2 < x < 3

D. 4 < x < 9

E. 16 < x < 81

9. What value of x solves the following proportion?

9/6= 8/x

A. 5 1/3

B. 6 3/4

C. 10 1/2

D. 11

E. 12