Multiple choice

If the average weight of 5 persons in a group is 60 kg. The average weight increased by 1 kg when a person left the group and a new person joined the group. What is the weight of the new coming person?

  1. 65 kg.

  2. 60 kg.

  3. 55 kg.

  4. Can’t be determined

  5. 50 kg.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial total weight = 5 × 60 = 300 kg. New total weight = 5 × 61 = 305 kg. Let the person who left have weight x and new person have weight y. Then 300 - x + y = 305, so y - x = 5. Without knowing x, we cannot determine y uniquely. The answer is 'Can't be determined'.

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