Q. If there are 200 questions in a 3 hr examination. Among these questions are 50 type A problems, which requires twice as much as time be spent than the rest of the type B problems. How many minutes should be spent on type A problems?

• 72 minutes totally spent on type A problems.
  
  Let X = Time taken for each of Type B Problems(150 Problems)
  And 2X = Time taken for each of Type A problems(50 problems)
  
  Total time period = 3hrs = 3*60min = 180minutes
  
  150X + 50(2X) = 180
  150X + 100X = 180
  250X = 180min
  
  X = 180/250
  X = 0.72min
  
  By convertiing into seconds,
  
  X = 0.72*60seconds
  X = 43.2sec
  
  So, time taken for Part A problems is = 43.2*2*50 = 4320 seconds
  = 4320/60sec = 72minutes
• 12 years agoHelpfull: Yes(32) No(1)
• x=time for type B prolems
  2x=time for type A problem
  
  total time=3hrs=180min
  150x+50*2x=180
  x=180/250
  x=0.72
  time taken for type A problem=50*2*0.72=72min
• 11 years agoHelpfull: Yes(13) No(0)
• x=time for type B prolems
  2x=time for type A problem
  
  total time=3hrs=180min
  150x+50*2x=180
  x=180/250
  x=0.72
  time taken for type A problem=50*2*0.72=72min
• 10 years agoHelpfull: Yes(3) No(0)
• x=time for type B prolems
  2x=time for type A problem
  
  total time=3hrs=180min
  150x+50*2x=180
  x=180/250
  x=0.72
  By convertiing into seconds,
  
  X = 0.72*60seconds
  X = 43.2sec
  
  So, time taken for Part A problems is = 43.2*2*50 = 4320 seconds
  = 4320/60sec = 72minutes
• 10 years agoHelpfull: Yes(1) No(0)
• Ans is 72
  
• 10 years agoHelpfull: Yes(0) No(0)