Every student in a certain classroom was given one colored marble. 1/2 of the students were given a blue marble, 1/3 of the students were given a yellow marble, and all of the other students were given a red marble. After lunch, 1/3 of the students who had blue marbles and 1/4 of the students who had yellow marbles left the classroom; the other students did not leave. What fraction of all students have either a blue or yellow marble now?	Pick one.
A) 7/9 B) 6/7 C) 5/7 D) 4/7 E) 4/9
Lets pick smart numbers. Total number of students in the classroom: 12   Blue marble (1/2): 6   Yellow marble (1/3): 4   Red marble (1/6): 2   7/9fter lunch   Blue marble: 4   Yellow marble: 3   Red marble: 2   New Total number of students in the classroom: 9   Blue and Yellow marbles: 7   7/9nswer 7/9 or 7/9
<result>A</result>
Every student in a certain classroom was given one colored marble. 1/2 of the students were given a blue marble, 1/3 of the students were given a yellow marble, and all of the other students were given a red marble. After lunch, 1/3 of the students who had blue marbles and 1/4 of the students who had yellow marbles left the classroom; the other students did not leave. What fraction of all students have either a blue or yellow marble now?