NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2020

RRB NTPC · Question 31

Avinash, Bhuvnesh and Chaman can complete a piece of work in 20, 30 and 60 days respectively. In how many days can Avinash complete the work if he is assisted by Bhuvnesh and Chaman on every third day?

  1. 15

  2. 18

  3. 16

  4. 12

Show answer & explanation

Answer: (A) 15

Explanation

Avinash does 1/20 a day; Bhuvnesh and Chaman together do 1/30 + 1/60 = 1/20. In every 3 days: 3/20 + 1/20 = 1/5 of the work. The whole takes 5 × 3 = 15 days.