A and B can together finish a work in 30 days. They worked at it for 20 days and then B let. The remaining work was done by A alone in 20 more days. B alone can do the entire work in Choose the correct choice from the following answers:
A) 48 days	B) 50 days	C) 54 days	D) 60 days	E) 67 days
A+B 's 1 day work = 1/30   A+B's 20 days work = 20*1/30 = 2/3   Remaining work left = 1-2/3 = 1/3   A does 1/3 work in ---&gt; 20 days   A does 1 work in ---&gt; x days   x = 3*20= 
<gadget id="calculator">3*20</gadget>
<output>60</output>
60 days   A ll take 60 days to complete the whole work   A's 1 day work= 1/60   Therefore B's 1 day work = (A+B)'s 1 day work - A's 1 day work   =&gt; 1/30 - 1/60   =1/60   So B's 1 day work = 1/60   B ll complete the entire work alone in 60 days   ANSWER:60 days
<result>D</result>
A and B can together finish a work in 30 days. They worked at it for 20 days and then B let. The remaining work was done by A alone in 20 more days. B alone can do the entire work in