If the average weight of 10 students is 25 kg and that of other 10 students is 35 kg, then the average weight of these 20 students is:

30 kg

average weight of 10 students = 25 kg

sum of weights = 250 kg

average of other 10 students = 35 kg

sum of weights = 350 kg

Sum of weights of 20 students = 600 kg

average of 20 students = 600/20 = 30 kg

The correct answer is Option (1) → 30 kg