In a school, the average weight of girls and boys are 30 kg and 36 kg. If the number of girls is twice the number of boys, then what will be the average weight of all the students in the school?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 32 kg.
Let number of boys = x
Then number of girls = 2x
Total weight = (30 × 2x) + (36 × x) = 60x + 36x = 96x
Total students = 2x + x = 3x
Average weight = 96x / 3x = 32 kg