There were 42 students in a hostel. Due to the admission of 13 new students, the expenses of the mess increase by Rs. 30 per day while the average expenditure per head diminished by Rs. 3. What was the original expenditure of the mess ?
A) Rs. 630 B) Rs. 580 C) Rs. 470 D) Rs. 690
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690 is a correct answer
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