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Discussion

  1. The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class. Therefore decreasing the average by 4 year. what was the original strength of class ?
    1. 10
    2. 11
    3. 12
    4. 15
  1. Correct Option: C

    Let original strength = y
    Then , 40y + 12 x 32 = ( y + 12) x 36
    ⇒ 40y + 384 = 36y + 432
    ⇒ 4y = 48
    ∴ y = 12


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