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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 83

Anil and Suman together can finish a job in 12 days, which Anil alone can do in 20 days. How long will Suman take alone?

  1. 28 days
  2. 29 days
  3. 30 days
  4. 27 days
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (C) 30 days

Explanation

Combined rate 1/12 minus Anil's 1/20 leaves Suman's rate 1/30.

  • (A) Incorrect

    Wrong: 1/12 − 1/20 = 1/30, not 1/28.

  • (B) Incorrect

    Wrong: incorrect.

  • (C) Correct

    Correct: Suman's rate = 1/12 − 1/20 = 1/30, so 30 days.

  • (D) Incorrect

    Wrong: incorrect.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.