A is twice as good a workman as B and they took 6 days together to do the work B alone can do it in?  Select:
A) 25 days
B) 18 days
C) 21 days
D) 11 days
E) 13 days
WC = 2:1   2x + x = 1/6   x = 1/18 =&gt; 18 days   Answer: 18 days
<result>B</result>
A is twice as good a workman as B and they took 6 days together to do the work B alone can do it in?