If 4 men or 6 women can do a piece of work in 12 days working 7 hours a day. How many days will it take to complete a work twice as large with 10 men and 3 women working together 8 hours a day ?

यदि 4 पुरुष या 6 महिलाएँ एक कार्य को 7 घण्टे प्रतिदिन कार्य करके 12 दिनों में कर सकते हैं, तो उसी कार्य से दुगुना बड़ा कार्य 10 पुरुष तथा 3 महिलाएँ 8 घण्टे प्रतिदिन कार्य करके कितने दिनों में पूरा कर सकेंगे ?

1. A6
2. B7
3. C8
4. D9 1

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Correct answer: B. 7

Explanation

4 men = 6 women, so 1 man = 1.5 women. Work = 6 × 12 × 7 = 504 woman-hours; double = 1008. 10 men + 3 women = 18 women × 8 h = 144 per day → 7 days.

1 पुरुष = 1.5 महिला। कार्य = 6 × 12 × 7 = 504; दुगना = 1008। 10 पु + 3 म = 18 महिला × 8 = 144 प्रतिदिन → 7 दिन।