The average weight of 20 boys in a class is 65 kg and that of remaining 35 boys is 32 kg. What is the average weight of all the boys in the class?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 44 kg.
Total boys = 20 + 35 = 55
Total weight = (20 × 65) + (35 × 32) = 1300 + 1120 = 2420
Average = 2420 ÷ 55 = 44 kg