Question

There are 28 students in Class 6B. Their average weight is 40 kg. If there are 16 boys in Class 6B and the average weight of the boys is 43 kg, what is the average weight of the girls in Class 6B?

a. 38 kg
b. 39 kg
c. 40 kg
d. 41 kg

Answer 1

The average weight of the girls in Class 6B is 36 kg/girl.

Step-by-step explanation:

To find the average weight of the girls in Class 6B, we need to subtract the total weight of the boys from the total weight of the class and then divide by the number of girls.

Total weight of the boys = 16 boys * 43 kg/boy = 688 kg

Total weight of the class = 28 students * 40 kg/student = 1120 kg

Total weight of the girls = Total weight of the class - Total weight of the boys = 1120 kg - 688 kg = 432 kg

Average weight of the girls = Total weight of the girls / Number of girls = 432 kg / (28 students - 16 boys) = 432 kg / 12 girls = 36 kg/girl