New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    In a classroom there are 11 boys and 9 girls. Average

    age of each boy and each girl is 18 years and 15 years respectively. The sum of ages of all the boys, girls and a teacher whose age is ‘x’ years is 380 years. Find the value of ‘x’.
    A 51 Correct Answer Incorrect Answer
    B 34 Correct Answer Incorrect Answer
    C 45 Correct Answer Incorrect Answer
    D 47 Correct Answer Incorrect Answer
    E 60 Correct Answer Incorrect Answer

    Solution

    Sum of ages of all boys = 11 x 18 = 198 Sum of ages of all girls = 9 x 15 = 135 So, 198 + 135 + x = 380 => x = 47

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