There were 35 students in a hostel. Due to the admission of 7 new students, ;he expenses of the mess were increased by Rs. 42 per day while the average expenditure per head diminished by Rs 1. Wbat was the original expenditure of the mess?
Options:
A . 428
B . 421
C . 422
D . 420
Answer: Option D
Let the original average expenditure be Rs. x. Then, 42 (x - 1)- 35 x = 42 7x=84 x =12. Original expenditure = Rs. (35 x 12) =Rs. 420. .
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