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    Question

    The average age of 30 students in a class is 18 years.

    The average age of another 20 students is 22 years. Find the average age of all the 50 students together.
    A 28.5 yrs Correct Answer Incorrect Answer
    B 19.6 yrs Correct Answer Incorrect Answer
    C 32 yrs Correct Answer Incorrect Answer
    D 48 yrs Correct Answer Incorrect Answer

    Solution

    Sum of ages of first group = 30 ├Ч 18 = 540 Sum of ages of second group = 20 ├Ч 22 = 440 Total sum = 540 + 440 = 980 Total students = 30 + 20 = 50 Overall average = 980 / 50 = 19.6 years.

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