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    Question

    The average age of 18 girls is 36 years. If the age of

    two more girls is added the average decreases by half a year. What is the sum of the age of new girls?
    A 60 Correct Answer Incorrect Answer
    B 63 Correct Answer Incorrect Answer
    C 65 Correct Answer Incorrect Answer
    D 62 Correct Answer Incorrect Answer
    E 69 Correct Answer Incorrect Answer

    Solution

    Total age of 18 girls = 18 × 36 = 648 years   If the age of two more girls is added the average decreases by half a year,   ∴ Total age of 20 girls = 35.5 × 20 = 710 Now, sum of the age of new girls = 710 – 648 = 62 years

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