EX.3.3 men and 4 boys can complete ...
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EX.3.3 men and 4 boys can complete and 4 boys can complete a piece of work m 12 days, 4 men and 3 boys can do the same work in 10 days. Then 21 finish the work in number of days is SSC CGL (Tier-I) 2012 Can (1) 17.days (2) 5 days (4) 22 days (3) 8 days

11th - 12th Class
Maths
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111
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Sol. ( (1) 12(3 operatorname{men}+4 text { boys })=10(4 operatorname{men}+3 text { boys }) ) ( Rightarrow 36 mathrm{men}+48 ) boys ( =40 mathrm{men}+30 ) boys ( Rightarrow 4 mathrm{men}=18 ) boys or ( 2 mathrm{men}=9 ) boys ( therefore 4 mathrm{men}+3 ) boys ( =21 ) boys who do the work in 10 days and, 2 men +3 boys ( =12 ) boys ( therefore quad mathrm{M}_{1} mathrm{D}_{1}=mathrm{M}_{2} mathrm{D}_{2} ) ( Rightarrow 21 times 10=12 times mathrm{D}_{2} ) ( Rightarrow mathrm{D}_{2} ) ( =frac{21 times 10}{12}=frac{35}{2}=17 frac{1}{2} ) days
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