Multiple choice

15 men or 25 women can complete a work in 120 days. 20 men start the work and after 30 days 30 women replaced them. Find the time taken by women to complete the remaining work. 15 पुरुष या 25 महिलाएं 120 दिनों में एक काम पूरा कर सकते हैं। 20 पुरुषों ने काम शुरू किया और 30 दिनों के बाद 30 महिलाओं ने उन्हें प्रतिस्थापित कर दिया। महिलाओं द्वारा बचे हुए काम को पूरा करने में लगा समय ज्ञात कीजिये।

  1. 65.25

  2. 66.67

  3. 67.5

  4. 65.83

  5. None of these इनमें से कोई नहीं

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

Total work = 15 men × 120 days = 1800 man-days. Also 25 women × 120 days = 3000 woman-days. So 15 men = 25 women, 1 man = 25/15 = 5/3 women. 20 men work for 30 days: work done = 20 × 30 = 600 man-days. Remaining work = 1800 - 600 = 1200 man-days = 1200 × (5/3) = 2000 woman-days. 30 women complete this in: 2000/30 = 66.67 days. Correct answer is option B.