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      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 ├Ч 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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