There were 35 students in a hostel. If the number of students is increased by 7 the expenditure on food increases by Rs.42 per day while the average expenditure of students is reduced by Rs.1. What was the initial expenditure on food per day ?
Options:
A . Rs.432
B . Rs.442
C . Rs.400
D . Rs.420
Answer: Option D Answer: (d)Suppose the initial expenditure per day = Rs. x ⇒ $x/35$ - ${x+42}/42$ = 1 ⇒ ${6x-5x-210}/210 = 1$ ⇒ x = 210 + 210 = Rs. 420
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