Question 1035914
A NOTE TO THE STUDENT ASKER:  The other tutor solving this problem apparently changed a minor detail of your question, which consequently changed the correct answer.  I have already reported her habitual malpractice to the site admin.  You can also report this if you want at ichudov@algebra.com 
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Since each student gets 40 ml of milk everyday, this is equivalent to 0.4 liter of milk everyday.

==> There  are {{{(24L)/(0.04L/student) = 600}}} students.