Multiple choice

Anand finishes a work in 7 days, Bittu finishes the same job in 8 days and Chandu in 6 days. They take turns to finish the work. Anand on the first day, Bittu on the second and Chandu on the third day and then Anand again and so on. On which day will the work get over?

  1. 3rd

  2. 6th

  3. 9th

  4. 7th

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work rates: A=1/7, B=1/8, C=1/6. Cycle (3 days) = 1/7 + 1/8 + 1/6 = (24+21+28)/168 = 73/168. After 6 days (2 cycles) = 146/168. Remaining = 22/168. Day 7 (Anand) does 1/7 = 24/168. Since 24/168 > 22/168, work finishes on day 7.