Elitmus Exam Numerical Ability Averages

in an examination ,the average marks obtained by the students was found to be 60.after omission of computational errors,the average marks of 100 candidates had to be changed from 60 to 30 and the average with respect to all the examinees came down to 45 marks.the total number of candidates who took the exam was how much?

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there are 35 students in a hostel.if the number of students is increased by 7 the expenditure on food increases by 42rs per daywhile the average expenditure of students is reduced by rs1.what was the initial expenditure on food per day