What does "c" represent

Question

There are 254 students in art club, robotics club and archery club. Each student can only be in 1 club. The art club has 4 times the amount of students then the robotics club. The archery club has 11 more than art club. If "c" represents the amount of students in art club. How many students are in the robotics club?

Answer 1

Then the archery club as c+11 and the robotics club has c/4 .

Altogether there are c + c+11 + c/4 = 254

1*c + 1*c + 11 + (1/4)c = 254

(9/4)c + 11 = 254

(9/4)c = 243

c = 243*4/9

c = 108

108 in the art club

108/4 = 27 in the robotics club

119 in the archery club