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  9. Q335

SSC GD Constable 2021 · Question 335 of 377

The average of 4 numbers is 60 and the 1 st number is 1 3 ​ of the sum of the remaining three numbers. What is the first number ?

average

  1. A120
  2. B60Correct
  3. C30
  4. D40

Answer: B. 60

Explanation

Given: The average of 4 terms is 60 and 1st term is 1 3 ​ of the remaining terms Concept used: Average = Sum of elements/number of elements Calculation: Let the sum of the remaining terms be 3x So, 1st term = 3x × (1/3) = x According to the question, x + 3x = 4 × 60 ⇒ 4x = 240 ⇒ x = 240/4 ⇒ x = 60 ∴ The first number is 60.

Source: SSC GD Constable 2021 Prev. Year Paper (2021-12-02 Shift 3) English — Prepp (with solutions) · reliable-secondary

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