# Thread: Number of students in Class

1. ## Number of students in Class

Delete please . . . .

2. Originally Posted by Aladdin
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The teacher has told the principle that there is :

Half of the students listen to the lesson
1/4 (quarter) of the students looks like they are listining to the lesson
1/7 of the students likes to talk when I'm giving the lesson.
The three left students are sleeping while I'm giving the question.

Can someone please give me the Final Answer , please

if we can assume that the students who "look like' they are listening are in fact
not listening and those who are talking are also not listening and do not look like they are listening (each group is seperate)

then, if x is the total number of students

$x\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{7}\right)+ 3=x$