Find the Average Marks of the Whole Class (approx.) is Closest:

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 in 87. If the girls and boys are in the ratio 4:5, average marks of the whole class (approx.) is closest to

  1. 85.9
  2. 86.1
  3. 86.4
  4. 86.5
Anurag Mishra Professor Asked on 26th October 2015 in Maths.
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1 Answer(s)

Answer is (2): 86.1

Explanation:-
The ratio of boys and girls of a class = 4: 5
The average marks obtained by the girls of a class = 85
Then, the total marks obtained by all girls = 85 x 4 = 340

The average marks obtained by the boys of a class = 87
Then, the total marks obtained by the all boys of a class = 87 x 5
 = 435

The total marks obtained by all boys and girls = 340 + 435
 = 775
Then, the average marks of whole class = 775/9
 = 86.1

Hence, the answer is (2) 86.1

Monis Rasool Professor Answered on 28th October 2015.
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