Multiple choice

The average weight of $10$ men is decreased by $ 3 \space kg$ when one of them whose weight is $80 kg $ is replaced by a new person. The weight of the new person is

  1. $70$
  2. $60$
  3. $50$
  4. $73$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total weight change = 10 men * 3 kg decrease = 30 kg decrease. New person's weight = 80 kg - 30 kg = 50 kg.

AI explanation

The total weight decrease for the 10 men is 10 times 3 kg, which equals 30 kg. For the new average to reflect this drop, the new person must weigh exactly 30 kg less than the 80 kg person he replaces. Therefore, the weight of the new person is 80 minus 30, which equals 50 kg.

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