A is thrice as good a work man as B and together they finish a piece of work in 12 days.The number of days taken by A alone to finish the work is :	Select the correct option.
A) 28 days .  B) 14 days .  C) 12 days .  D) 16 days .  E) 18 days .

Rationale: solution ( a ’ s 1 day ’ s work ) : ( b ’ s 1 day ’ s work ) = 3 : 1 . ( a + b ) ' s 1 day ’ s work = 1 / 12 divide 1 / 14 in the ratio 3 : 1 . ∴ a ’ s 1 day ’ s work = ( 1 / 12 x 2 / 3 ) = 1 / 16 hence , a alone can finish the work in 16 days . answer d
Answer: D