Question

    TYPE 2

    The average age of 21 girls is 43 years. If the age of

    two more girls is added the average decreases by three years. What is the sum of the age of new girls?
    A 18 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 17 Correct Answer Incorrect Answer
    E 23 Correct Answer Incorrect Answer

    Solution

    Total age of 21 girls = 21 × 43 = 903 years   If the age of two more girls is added the average decreases by three years,   ∴ Total age of 23 girls = 40 × 23 = 920 Now, the sum of the age of new girls = 920 – 903 = 17 years

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