New Enroll in RBI Gr B 2025 Exclusive New Batch on March 18

    Question

    Out of four numbers the average of the first three is 16

    and that of the last three is 15. If the last number is 20 then the first number is
    A 23 Correct Answer Incorrect Answer
    B 25 Correct Answer Incorrect Answer
    C 28 Correct Answer Incorrect Answer
    D 21 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let three numbers be a, b and c respectively a + b + c = 16 x 3 = 48 ….(i) b + c + 20 = 15 x 3 = 45 b + c = 45 – 20 = 25 …..(ii) By Subracting, equation (i) – (ii) a = 48 – 25 = 23

    Practice Next

    Relevant for Exams: