A is twice as good a workman as B and they took 9 days together to do the work B alone can do it in?
Pick
A) 25 days	B) 88 days	C) 21 days	D) 27 days	E) 13 days
WC = 2:1   2x + x = 1/9   x = 1/27 =&gt; 27 days   Answer: 27 days
<result>D</result>
A is twice as good a workman as B and they took 9 days together to do the work B alone can do it in?