A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in :	Choose the most appropriate option.
A) 8 days  B) 10 days  C) 12 days  D) 15 days  E) 18 days
Explanation:   (A + B)'s 1 day's work =(1/15 + 1/10)=1/6   Work done by A and B in 2 days =(1/6 X 2)=1/3   Remaining work =(1-1/3)=2/3   Now,	1/15work is done by A in 1 day.   2/3work will be done by a in	(15 X 2/3)= 10 days.   Hence, the total time taken = (10 + 2)= 
<gadget id="calculator">(10 + 2)</gadget>
<output>12</output>
12 days.   ANSWER IS 12 days
<result>C</result>
A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in :