State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · வினா 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
விடையைக் காட்டு & விளக்கம்

விடை: (C) 30 days

விளக்கம்

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

  • (A) தவறு

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

  • (B) தவறு

    Wrong: incorrect.

  • (C) சரி

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

  • (D) தவறு

    Wrong: incorrect.

  • (E) தவறு

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