Multiple choice

The average age of $45$ persons is decreased by $\cfrac 19$ year when one of them having $60$ years is replaced by a new comer. Then, the age of the new comer is

  1. $48$ years
  2. $46$ years
  3. $50$ years
  4. $55$ years
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total age change = 45 * (1/9) = 5 years. Since the average decreased, the new person is younger than the one replaced. New age = 60 - 5 = 55.

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