A and B can complete a job in 30 and 20 days respectively. They start working together and B leaves 5 days before the work is finished. In how many days is the total work finished?
Answers:
A) 15	B) 6	C) 5	D) 4	E) 3
A and B can do the job in 30 and 20 days individually, so together they will take 30*20/(30 + 20) = 600/50= 
<gadget id="calculator">600/50</gadget>
<output>12</output>
12 days.   The work that A can do in 5 days is 1/6th. So, A left when 5/6th of the work was done or A left after  (5/6)*12= 
<gadget id="calculator"> (5/6)*12</gadget>
<output>10</output>
10 days   Total time taken= 10 + 5= 
<gadget id="calculator">10 + 5</gadget>
<output>15</output>
15 days.   15NSWER:15
<result>A</result>
A and B can complete a job in 30 and 20 days respectively. They start working together and B leaves 5 days before the work is finished. In how many days is the total work finished?