A is half good a work man as B and together they finish a job in 10 days. In how many days working alone B finish the job?  Choose the correct option:  A) 98 days  B) 21 days  C) 17 days  D) 18 days  E) 15 days
WC = 1:2   2x + x = 1/10 =&gt; x = 1/30   2x = 1/30 =&gt; 15 days   Answer:15 days
<result>E</result>
A is half good a work man as B and together they finish a job in 10 days. In how many days working alone B finish the job?