Multiple choice

A and B can do a piece of work in 25 days and 30 days respectively. They work together for 5 days and then A leaves. B will finish the rest of the work in how many days? A और B क्रमशः 25 दिन और 30 दिनों में किसी कार्य को कर सकते हैं। वे 5 दिनों के लिए एक साथ काम करते हैं और फिर A छोड़कर चला जाता है। शेष काम को B कितने दिनों में खत्म करेगा?

  1. 18 days/दिन

  2. 19 days/दिन

  3. 20 days/दिन

  4. 21 days/दिन
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A's rate = 1/25 per day, B's rate = 1/30 per day. Combined rate = 1/25 + 1/30 = 11/150. In 5 days they complete 5 x 11/150 = 55/150 = 11/30. Remaining work = 19/30. B alone needs (19/30) / (1/30) = 19 days.

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