Multiple choice

Average weight of a group of 15 members is increased by 850 grams when a new person of weight 72 Kg joined the group. Find the sum of weight of all members in group earlier.

  1. 875

  2. 752

  3. 899

  4. 795

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Let original average = x kg. Original total = 15x. New total = 15x + 72. New average = (15x + 72) / 16 = x + 0.85. Solving: 15x + 72 = 16x + 13.6, which gives x = 58.4. Original sum = 15 × 58.4 = 876 kg. None of the given options (875, 752, 899, 795) match 876.

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