A school having four classes only have student strength of 10, 20, 30 and 40 respectively. The pass percentages of these classes are 20%, 30%, 60% and 100% respectively. What is the pass percentage for the entire school?

(a)56% (b)76% (c)34% (d)66%

• ans (d) coz total student passed is 2+6+18+40 = 66
  and total students 10+20+30+40= 100
  so pass percentage of school 66%.
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• (d)66%
  20% of 10+30% of 20+60% of 30+100% of 40
  =2+6+18+40 =
  now 66% of 100
  = 66
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• 66%because first class pass 2,second class 6,third class 18,fourth class 40.total pass 66. total student 100
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• d)66%
  20% of 10+30% of 20+60% of 30+100% of 40
  =2+6+18+40 =
  now 66% of 100
  = 66
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• class1->(20% of 10)=2
  class2->(20% of 30)=6
  class3->(30% of 60)=18
  class4->(100% of 40)=40
  total passed=66
  %age=66/total students(=100)*100=66%
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• 20% of students passed out of 10 students of first class i.e "2" students.
  like that 30% of 20 students means "6" students.
  60% of 30 students means "18" members.
  100% of 40 students means "40" members.
  so total students passed = 2+6+18+40 = 66
  the total students in four classes = 100.
  there fore average % of students passed = (66/100)*100% = 66%.
  
• 13 years agoHelpfull: Yes(1) No(0)
• 20% of 10=2
  30% of 20=6
  60% of 30=18
  100% of 40=40
  so, total pass students = 2+6+18+40=66
  total no. of students in the school considering all the four classes = 100
  this means 66 out of 100 have passed .....so passs percentage is 66 per 100 ....that is ....." 66% "
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• ans : d, total students = 10+20+30+40 =100
  total passed students = 0.2(10)+20(0.3)+30(0.6)+40(1) = 66
  total pass percentage = (66/100)*100 = 66%
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