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Answer:
There is some problem in the question. I think that the no. of students in class IX should be more than 220, because it is asked that how many students have none of the both hobbies. So for that we need to do 130 + 180 + 110. The ans is 420 but we still have to subtract it from 220 which is possible but the answer would come in negative. The last two questions are easy. Please once confirm it with someone because I'm to not fully sure about it. And can you just tell me one thing that they have said that 110 is the no. of students who like both rock climbing and sky watching so is that 110 children of class IX only or some other students? If they are not the students of class IX than I think we can get the answer but if they are of the class IX then I don't think we can get the answer. As I said confirm with your teacher or your tuition teacher or your elder brother or sister if you have or your parents.
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