The average weight of 100 students is 32 kg. The average weight of first 49 students is 30 kg and of last 50 students is 34 kg. What is the weight (in kg) of the 50th student?
Total weight of 100 students = $$100 \times 32$$ = Rs. 3200 kg
Total weight of first 49 students = $$49 \times 30$$ = Rs. 1470 kg
Total weight of last 50 students = $$50 \times 34$$ = Rs. 1700 kg
$$\therefore$$ Weight of the 50th student = 3200 - (1470 + 1700) = 3200 - 3170
= 30 kg
=> Ans - (B)
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