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A picture of a Venn diagram is in the related links. They are useful because they help you map out problems such as "If there are 3 students in math, 5 students in science and 6 students in total, how many are in both math and science?" To this, you can use the Venn diagram to reason that since there seem to be 8 students in total if math and science are separate, there must be 2 students in both classes.
It is impossible you watch too many science fiction games and movies
Since 6 students like neither, 21 students like math, and 2 students like physics, then only one student likes both math and physics (30 - 29).
In my class, i have 11 classmates in another school they have 27 students, so I'm like this is too many students! Well, i believe it should have at least 15-20.
Just like a clock face: 12 students.