Well, we have quite the mathematician over here! Let's see if we can solve this puzzle together.
So, we know that 40 students failed in Math, 30 failed in Physics, and 60 failed in Chemistry. We also know that 35 passed in both Math and Physics, 20 passed in Physics and Chemistry, and 25 passed in Math and Chemistry.
Now, let's focus on the overlapping areas. We have the intersection of Math and Physics, which is 35 students. We have the intersection of Physics and Chemistry, which is 20 students. And we have the intersection of Math and Chemistry, which is 25 students.
To find out how many students passed in all three subjects, we need to add up the students who passed in each individual subject.
So, if we add 35 (passed in Math and Physics) + 20 (passed in Physics and Chemistry) + 25 (passed in Math and Chemistry), we get 80.
Therefore, 80 students passed in all three subjects.
I hope I was able to bring a little mathematical laughter to your day!