Question

In a survey of 200 students of a school, it was found that 60% study mathematics, 45% study
physics, 35% study chemistry, 20% study mathematics and physics, 15% study physics and
chemistry, 25% study chemistry and mathematics and 10% none of these subjects. Find the
number of students who study all the three subjects using Venn diagrams only.

Answer 1

so, did you draw your diagram? Just start filling in the spaces.

Answer 2

answer => 40
200=120+90+70-40-30-50+X
=> X=200-160 = 40

Answer 3

Answer is 20 because 10% means 20 student are those which are not studying any subject.