4 men or 6 boys can do a piece of work in 40 days. In how many days 6 men and 11 boys can do this work?4 पुरुष या 6 लड़के एक काम को 40 दिन में करते हैं, उस काम को 6 आदमी तथा 11 लड़के कितने दिन में करेंगे?
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