1.

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is

Answer»

8/15



A's 1 DAY's work = 1/15 ;

B's 1 day's work = 1/20 ;

(A + B)'s 1 day's work = ( 1/15 + 1/20 ) = 7/60 .

(A + B)'s 4 day's work = ( 7/60 x 4 ) = 7/15 .

THEREFORE, Remaining work = ( 1 - 7/15 ) = 8/15 .



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