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. What was the original expenditure of the mess?	Pick one.
A) 320 B) 120 C) 400 D) 420 E) 514
Sol. Let the original average expenditure be Rs. x. Then,   42 (x - 1) - 35x=42		7x= 84		x =12.   Original expenditure = Rs. (35 x 12) =Rs. 420. .   ANSWER 420
<result>D</result>
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. What was the original expenditure of the mess?