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

• Let original average expenidture was X.
  Total expenditure = 35X.
  Now, According to question,
  35X+42 = (X - 1)*42
  35X + 42 = 42X - 42
  7X = 84
  X = Rs. 12
  So, Initial expenditure would be 12 *35 = Rs. 420
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