Question

    The average age of 13 girls is 40 years. If the age of

    one more girl is added the average decreases by half a year. What is the age of new girl?
    A 37 Correct Answer Incorrect Answer
    B 33 Correct Answer Incorrect Answer
    C 35 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    Total age of 13 girls = 13 × 40 = 520 years If the age of one more girl is added the average decreases by half a year, ∴ Total age of 14 girls = 39.5 × 14 = 553 Now, Age of the new person = 553 – 520 = 33 years

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