600 students took the test on physics and chemistry. 35% students failed in physics and 45% students failed in chemistry and 40% of those who passed in chemistry also passed in physics, then how many students failed in both:
Correct Answer: None of these
Physics Chemistry
Failed 35% 45%
Passed 65% 55%
Passed in both = 22% of total student
percentage of students who are passed in any of the physics or chemistry or both =(65+55) - 22 = 98%
So, the percentage of students who are failed in both = 2%
Therefore, total failed (in both subjects) students = 12