The average marks of a student in 10 papers are 80. If the highest and the lowest scores are not considered, the average becomes 81. If his highest score is 92, find the lowest.
option
a) 55
b) 60
c) 62
d) Can't be determined

• ans is 60
  sum of 10 marks=80*10=800
  sum of 8 marks=81*8=648
  800-648=max+min
  152=92+min
  min=60
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• Total sum of 10 subjects marks=80*10=800
  Total sum of 8 subjects marks=81*8=648
  
  the lowest score=800-648-92=60
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• 10 papers*80=800
  highest score is 92
  800-92=708
  708-X/8=60
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• 80*10-81*8=152
  152-92=60
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• marks out of 1000 is 800 as 80% is given
  so now if highest and lowest excluded then percentage is 81 so marks are
  800*81/100=648
  differecnce is 800-648=152
  152 is sum of highest and lowest so highest is given and lowest can be find.
  152-92=60 ANS.
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• x/10=80,
  x=800.
  (x-(92+l))/8=81,
  x=60 Ans.
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