240 students in a school were interviewed and their hobbies were noted. 150 students were interested in stamp collection, 80 took delight inreading books, 40 of them do not like either. What is the number of students who liked both stamp collection and reading books? {The following question answers is 3}

240 students in a school were interviewed and their hobbies were noted

1.	240 students in a school were interviewed and their hobbies were noted. 150 students were interested in stamp collection, 80 took delight inreading books, 40 of them do not like either. What is the number of students who liked both stamp collection and reading books? {The following question answers is 3}
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