Math
posted by Jessica .
By 7:00P.M., 1/3 or the junior class has arrived at a school dance. By 8:09PM., 30 more juniors had arrived, raised attendance to 1/2 of the juniors class. How many people are in the juniors class?
I donâ€™t understand.. can someone help?
A 30
B90
C120
D180
E240

Math 
Scott
(1/3 c) + 30 = 1/2 c
Respond to this Question
Similar Questions

Statistics
A class has 50 students. 13 are juniors, 20 are psych majors, and 24 are neither psych majors nor juniors. How many psych majors are juniors? 
Physics
A class has 50 students. 13 are juniors, 20 are psych majors, and 24 are neither psych majors nor juniors. How many psych majors are juniors? 
math
A class consist of 2/5 freshman,1/4 sophomores, and 1/10 juniors; the rest are seniors. What fraction of class are seniors? 
statistics
In a particular class, there are 3 freshmen, 5 sophomores, 11 juniors, and 2 seniors. If the instructor randomly chooses a student to answer a question in class, what is the probability that the student chosen will be a freshman? 
statistics
True or false> in a physics class there are 9 juniors and 21 males. Then there must be 30 male juniors in this class. 
Algebra 2
Amanda surveyed 20 juniors and seniors at Delamar high school to find the number of hours per week they spend working at parttime jobs. Her results are shown below. Juniors: 20,10,20,10,15,0,0,10,20,15 Seniors: 20,20,10,10,0,0,0,10,0,10 … 
Geometry
In a class of 50 high school juniors, 32 students either play a sport or are in the marching band. There are 22 juniors who playa sport and 16 who are in the marching band. What is the probability that a randomly selected junior plays … 
Math
A college class with 30 sophomores, 18 juniors, and 12 seniors is divided into project groups where each group has the same number of sophomores, juniors, and seniors. What is the greatest number of groups that can be formed? 
SAT Math
All of the students who took chemistry at Groveton High School last year were juniors or seniors, as shown in the table below. If 80% of the students who took chemistry passed, then what fraction of the students in the combined junior … 
Algebra 2
Amanda surveyed 20 juniors and seniors at Delmark Highschool to find the number of hours per week they spend working at part time jobs. Her results are shown below Junior  20,10,20,15,0,0,10,20,15 Senior  20,20,10,10,0,0,0,10,0,10 …