Question

    The average of five consecutive multiples of 3 is 24. What

    is the smallest of these numbers?
    A 18 Correct Answer Incorrect Answer
    B 21 Correct Answer Incorrect Answer
    C 28 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the first number be 'x'

    Therefore, the five consecutive multiples of 3 will be 'x', (x + 3), (x + 6), (x + 9), (x + 12)

    ATQ:

    x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 5 × 24

    Or, 5x + 30 = 120

    Or, 5x = 120 - 30

    Or, 5x = 90

    Or, x = 90 ÷ 5 = 18

    Therefore, the first number = 18

    So, the smallest number is = 18

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