# 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

- 85.9
- 86.1
- 86.4
- 86.5

**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