A is twice as good a workman as B and together they finish a piece of work in 18 days. In how many days will A alone finish the work?  Choose the correct choice from the following:  A) 27 days.  B) 32 days.  C) 18 days.  D) 33 days.  E) 29 days.
A   27 days.   If A takes x days to do a work then B takes 2x days to do the same work.   --&gt; 1/x+1/2x = 1/18   --&gt; 3/2x = 1/18   --&gt; x = 27 days.   Hence, 27 days. alone can finish the work in 27 days.
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A is twice as good a workman as B and together they finish a piece of work in 18 days. In how many days will A alone finish the work?