Question

Sol. (1) ( (A+B) ) together do the work in 30 days.
( therefore(A+B)^{prime} s 1 ) day's work ( =frac{1}{30} )
( therefore(A+B)^{prime} s 20 ) day's work ( =frac{20}{30}=frac{2}{3} )
Remaining work ( =1-frac{2}{3}=frac{1}{3} )
Time taken by A in doing ( frac{1}{3} ) work ( =20 ) days
( therefore ) Time taken in doing 1 work ( =20 times 3=60 ) days

# Ex.2. A and B can together fini a B can together finish a work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in more days.A alone can finish the work in (1) 60 days (2) 54 days (3) 48 days (4) 50 days SSC CGL (Tler-I) 2014

Solution