PLEASE HELP 5th grade math
posted by Skylar .
There are 28 students in zacks class.one forth are absent how many students are present? Answer choises a.16 b.7 c.9 d.21

YES I WOULD LIKE HELP1!!!

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
Use same process. 
workers placed 4 additional rows of seating in each of the 8 theaters at the movie complex. Each additional row contained 28 seats. What is the total number of seats that were added to the movie complex?