1.

A and B can do a piece of work in 4 days. If A can do it alone in 12 days, B will finish the work in

Answer»

6 days



If A and B together can do a piece of work in x days and A ALONE can do the same work in y 

days, then B alone can do the same work in x y/ y – x days. 

THEREFORE, the number of days B will TAKE to finish the work = 4 × 12/ 12 – 4 

= 48/8 = 6 days.



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