There are 50 students in a class, of which 40 are boys. The average weight of the class is 44 kg and that of girls is 40 kg. Find the average weight of the boys.

Answer:- Total students in the class = 50
Number of boys = 40
∴ Number of girls = (50 – 40) = 10
Regular weight of students in the class = 44 kg
Regular weight of girls in the class = 40 kg
Sum of the weights of girls in the class = (40 ×10) kg = 400 kg
Therefore, we have:

The regular weight of students in the class = Total heaviness of girls in the class + Total weight of boys in the class Total number of students in the class ⇒44=400+Total weight of boys in the class50⇒Total weight of boys in the class+400=2200⇒Total weight of boys in the class=1800kgThe average weight of boys =180040=45kg