Multiple choice

To do certain work, the ratio of efficiency of A and that of B is 3:7. Working together, they can complete in 10.5 days. they work together for 8 days. 60 % of remaining work will be completed by A alone in किसी कार्य को करने के लिए A और B की कार्यकुशलता का अनुपात 3:7 है। एक साथ काम करते हुए, वे 10.5 दिनों में पूरा कर सकते हैं। वे 8 दिनों तक एक साथ काम करते हैं। शेष कार्य का 60% अकेले A द्वारा में पूरा किया जाएगा

  1. 10 days 10 दिन

  2. 5 days 5 दिन

  3. 12 days 12 दिन

  4. 7 days 7 दिन

  5. 11 days 11 दिन
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Efficiency ratio A:B = 3:7. Combined rate = 10 units/day, work = 10 × 10.5 = 105 units. In 8 days, they complete 80 units, leaving 25 units. A's rate = 3 units/day. 60% of 25 = 15 units. Time for A = 15/3 = 5 days. Option B is correct.

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