SSC CGL Tier II 25 Oct 2015 Paper 1

Question : 87 of 100

Marks: +1, -0

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 (approximately) is closest to

85.9
86.1
86.4
86.5

Validate

Solution:

(2) Number of girls = 4x
Number of boys = 5x
∴ Required average marks

= {4 x × 85+5 x × 87}/{4 x+5 x}

= {340+435}/{9}= {775}/{9}=86.1

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