a person secured 30 of 50 in history and 20 of 60 in physics and x of 40 in chemistry if the person has secured an average of 60% in the 3 subjects what should be the value of x?

• (marks scored/total marks)*100=(30+20+x)/(50+60+40)*100=60
  50+x/150=60
  x=40
  So he have to score full marks ie 40/40 for scoring 60%
• 11 years agoHelpfull: Yes(21) No(2)
• total marks=50+60+40=150
  obtained mark=30+20+x=50+x
  given (50+x)=150*60/100=90
  so x=40
• 11 years agoHelpfull: Yes(6) No(3)
• % in history=(30/50)*100=60%
  percentage in physics=(20/60)*100=33.33%
  percentage in chem=(x/40)*100=5x/2%
  and average (60+33.33+5x/2)/3=60
  so x=34.66 ans
• 11 years agoHelpfull: Yes(5) No(7)
• 34.66
  30 of 50=60%
  20 of 60=33.33%
  x of 40 =2.5x%
  [60+33.33+2.5x]/3=60
  x=34.66
• 11 years agoHelpfull: Yes(2) No(2)
• 60% of 150 = 90
  90-30-20-40
  so 40 is ans
• 11 years agoHelpfull: Yes(1) No(3)
• but 40 is given in options
• 11 years agoHelpfull: Yes(1) No(2)
• sol. as follow......bcoz Max. mark of every sub. is not same....so take %tage of particular sub. marks....nd then take avg.
  % in history=(30/50)*100=60%
  percentage in physics=(20/60)*100=33.33%
  percentage in chem=(x/40)*100=5x/2%
  and average (60+33.33+5x/2)/3=60
  so x=34.66 ans
  
• 11 years agoHelpfull: Yes(1) No(0)
• 30/50+20/30+x/40=60
  x=4/3
• 11 years agoHelpfull: Yes(0) No(8)
• 50+x/110*100=60
  i.e x=16
• 11 years agoHelpfull: Yes(0) No(5)
• sry it was 50+x/115*100=60
  i.e x=40
• 11 years agoHelpfull: Yes(0) No(1)
• ans=40
  
  
  marks scored=(30+20+x)
  total marks =50+60+40 =150
  
  (marks scored/total marks)=.6
  
  marks scord =150*.6 =90
  
  x= 90-30-20=40
• 11 years agoHelpfull: Yes(0) No(2)
• max marks=(50+60+40)=150
  30% of 150= 90
  30+20+x=90
  x=40
  
• 11 years agoHelpfull: Yes(0) No(1)
• given ((50+x)/150)*100=60
  then x=90-50=40
  value of x is 40
• 11 years agoHelpfull: Yes(0) No(1)
• total of 2 subjcts =110 for 3 subjects=150
  for history out of 50 he secured 30
  for physics out of 60 he secured 20
  so total 0f 2 subjects =(50/110)*100 =33.33333333
  and remaining percentage is 26.666666666667 inorder to make it 60%
  so if we add 40 to the marks i.e 30+20+40=(90/150)*100=60%
  
  
  
• 11 years agoHelpfull: Yes(0) No(0)
• 30/50+20/60+x/40=60/100
  3/5+1/3+x/40=3/5
  40/3
  for 3 subjects so we neglect the 3
  x=40
  chemistry marks=40/40
  60%
• 10 years agoHelpfull: Yes(0) No(1)