In an examination average marks obtained by the girls of a…

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In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4 : 5, average marks of the whole class (approx.) is closest to :

  1. A. 86.5
  2. B. 85.9
  3. C. 86.4
  4. D. 86.1

Answer: Option D

Here is complete explanation of In an examination average marks obtained by the girls of a….

Solution(By ExamCraze Team)

Average of whole class
$$eqalign{ & = frac{{85 times 4 + 87 times 5}}{{5 + 4}} cr & = frac{{340 + 435}}{9} cr & = frac{{775}}{9} cr & = 86.1 cr} $$

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