The average weight of 22 girls in a class is 58kg and the average weight of 28 boys in the same class is 60kg. What is the average weight of all the 50 students in that class?

(B) 59.12 kg

Explanation

Since 22 girls are 2kg short of 60kg, total class weight is 44kg short of 3000 kg = 2956 kg. To divide by 50, double and divide by 100.