Students of three different classes appeared in common examination Pass average…

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Students of three different classes appeared in common examination. Pass average of 10 students of first class was 70%, pass average of 15 students of second class was 60% and pass average of 25 students of third class was 80% then what will be the pass average of all students of three classes?

  1. A. 74%
  2. B. 75%
  3. C. 69%
  4. D. 72%

Answer: Option D

Here is complete explanation of Students of three different classes appeared in common examination Pass average….

Solution(By ExamCraze Team)

$$eqalign{ & {text{Sum}},{text{of}},{text{pass}},{text{student}},{text{}},{text{first,}},{text{second}},{text{and}},{text{third}},{text{class}}, cr & = left( {70% ,{text{of}},10} right) + left( {60% ,{text{of}},15} right) + left( {80% ,{text{of}},25} right) cr & = 7 + 9 + 20 = 36 cr & {text{Total}},{text{students}},{text{appeared}}, cr & = 10 + 15 + 25 = 50 cr & {text{Pass}},{text{average}}, cr & = 36 times frac{{100}}{{50}} = 72% cr} $$

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