The average weight of boys in a class is 40 kg and the average weight of girls in the same class is ...........

Quantitative Aptitude (CDS) Mixture and Alligation

The average weight of boys in a class is 40 kg and the average weight of girls in the same class is 30 kg. If the average weight of the whole class is 36.5 kg, what could be the possible strength of boys and girls respectively in the same class?

14 and 26

7 and 13

17 and 27

None of these

Explanation:

Number of boys: number of girls = 40 – 36.5/36.5 – 30
= 3.5/6.5
= 35/65 = 7/13
Therefore, the possible strength of boys and girls in the same class is 7 and 13 respectively.