students secured first class in English are 35
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1. it will be 150-115 that is 35 students score first class in english
2. but as ur que is than the ans will be 150 students score first class in english because in ur que it is written that 150 students secure first class in english or maths  which means either in one , then u write that in maths 115 students secure first class than its clear that 150 students described at first have secured first class in english  not in maths
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hope this will help u
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