Subject: mathqa
Question: there are 3000 students in a school and among them 20 % of them attends chess class . 40 % of the students who are in the chess class are also enrolled for swimming . no other students are interested in swimming so how many will attend the swimming class if all enrolled attends ?
Option: 
A: 20
B: 240
C: 50
D: 10
Answer: B