Multiple choice

The average weight of first 11 persons among 12 persons is 95 kg. The weight of 12th person is 33 kg more than the average weight of all the 12 persons. The weight of the 12th person is

  1. 128 kg

  2. 97.45 kg

  3. 128.75 kg

  4. 131 kg

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let average of all 12 be x. Total of first 11 = 11 × 95 = 1045. Total of all 12 = 12x. So 12th person = 12x - 1045. Given: 12th person = x + 33. So 12x - 1045 = x + 33, giving 11x = 1078, so x = 98. Thus 12th person = 98 + 33 = 131 kg.