the cap problem

here is an excellent puzzle.
a class contains 30 students.15 of them having red cap and rest having blue cap.no one knows what cap he has but can see other's.they don't talk between themselves.the teacher came & asked the students with red cap to get out.none responded & the teacher knew that.now he identified a student with a red cap & made him out.now all the students with red cap identified themselves & got out.how did this happen?(no one knows the information that 15 had red & rest had blue cap)

5 Answers

158
Anik Chatterjee ·

maybe there were 2 rows of benches....in the 1st row the red cap students were seated.......and in the second row the blue cap students....seeing one of the students of their own row going out.....the remaining students assumed that they also have red caps and they got out.....
i dont think that i am correct...

11
sougata nag ·

its logic.
there is no place of may be.

1
Rohit Ghosh ·

THE BLUE BOYS TOLD THE RED BOYS TO GET OUT AS THE BOYS WITH THE BLUE CAPS COULD SEE THE BOYS WHO HAVE A RED CAP ON THEIR HEAD.

1
Rohit Ghosh ·

SORRY, MY FIRST ANSWER IS WRONG. THE BLUE BOYS PUSHED THE RED BOYS OUT OF THE ROOM.

269
Astha Gupta ·

ammm...i think the boys didn't knw anything about the colors...so wen the t'cher asked the red ones' to get out..they didn't understand...so they didn't respond...but the teacher knew about the colors...so she identified a student with a red cap..and then the other students with red cap..saw their caps to be identical with that of the red cap..so..they understood that...they have to come out....

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