the number of questions answered wrongly ?

Replies

• 

  Sahithi Pallavi

  I think its 11.
  
  Am I right?
• 

  Saandeep Sreerambatla

  The answer should be 10.
  
  Since, if we consider student to answer 36 questions correctly, then there would be 14 questions left.
  
  Out of which 10 answered incorrectly and 4 left.
  
  which adds up to 10*1/3 + 4*1/6 = 4.
  
  Thus he scored 36-4 = 32 marks.
• 

  Sahithi Pallavi

  yes 10 is the correct answer, Mistakenly I said as 11.
• 

  rengaraj

  I suggest both answers 10 & 11 are incorrect.
• 

  Sahithi Pallavi

  Oh!! Then whats the answer rengaraj.
• 

  rengaraj

  Dear Sahithi
  I am not sure of the right answer. But, Out of given choices your answer doesn't exist.
  R.Rengaraj
• 

  rengaraj

  the provided choices are
  a. 6
  b. 12
  c. 3
  d. 9
• 

  vik001ind

  Suppose
  no of correct answers = x
  no of wrong answers = y
  no of unattempted questions = z
  Therefore we will have 2 equations after evaluating it, that are
  x + y + z = 50 ----------(1)
  (x - y*1/3 - z*1/6 =32 ) => 6x -2y - z = 192 --------------(2)
  now add both of them
  we will get
  7x - y = 242 or 7x - 242 = y -----------(3)
  we know that x & y must be positive integers including 0
  least possible no. of y = 3 for y to be +ve where x = 35 (7*35 - 242 = 3 )
  
  so answer (c) 3
• 

  rengaraj

  Thanks for your explanatory answer.
  R.Rengaraj
• 

  Saandeep Sreerambatla

  Nice explanation thanks Vik!!