28. If 16 men or 20 women can do a ...
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28. If 16 men or 20 women can do a piece of work in 25 days. In what time will 28 men and 15 women do it? (1) 142 days (3) 182 days (2) 33. days (4) 10 days days

11th - 12th Class
Maths
Solution
143
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28. (4) 16 men ( =20 ) women ( Rightarrow quad 4 mathrm{men}=5 ) women ( therefore 28 mathrm{men} ) and 15 women ( =28 times frac{5}{4}+15 ) ( =50 ) women By ( M_{1} D_{1}=M_{2} D_{2} ) ( 20 times 25=50 times D_{2} ) ( therefore quad D_{2}=frac{20 times 25}{50}=10 ) days
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