Multiple choice

A can do a peice of work in 20 days and B in 40 days. A started the work there after they work alternatively one on each days on which day will the work be completed? A किसी काम को 20 दिनों में वहीं B उसी काम को 40 दिनों में कर सकता है। A काम की शुरूआत करता है और उसके बाद वे एकान्तर क्रम में काम करते हैं तो काम किस दिन पूरा होगा?

  1. 24th day/दिन

  2. 27th day/दिन

  3. 25th day/दिन

  4. 29th day/दिन
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A does 1/20 work per day, B does 1/40. In 2-day cycles (A then B), they complete 1/20 + 1/40 = 3/40. After 13 cycles (26 days), 39/40 is done, 1/40 remains. On day 27, A completes 1/40, finishing the work. So work completes on the 27th day with B's turn.

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