there were 35 students in a hostel.if the no of students are increased by 7 the expenditure on food increases by 42 per day while the average expenditure of students is reduced by re1.what was the initial expenditure on food per day.

• x = initial expenditure
  previous expenditure = x/35
  when number of students increased by 7 = (x + 42)/42
  average expenditure reduced by 1, therefore (x/35) - (x+42)/42=1
  x = 420
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