A is twice as good a workman as B and they took 10 days together to do the work B alone can do it in.
Options:
A) 17 days
B) 12 days
C) 30 days
D) 25 days
E) 27 days
W30 days = 2:1   2x + x = 1/10   x = 1/30 =&gt; 30 days   ANSWER:30 days
<result>C</result>
A is twice as good a workman as B and they took 10 days together to do the work B alone can do it in.