George takes 30 days to do a piece of work and Mark takes 45 days for the same work. For the first 15 days only George works. Then Mark also joins him. Find the time taken to complete the entire work. Choices: A) 24 days B) 25 days C) 26 days D) 27 days E) 28 days
George 1 day work= 1/30   Mark 1 day work= 1/45   George 15 day work= 15*1/30 =1/2   Work remaining= 1-1/2 =1/2   George + Mark 1 day work= 1/30 + 1/45 =1/18   Number of day required to complete 1/2 work= (1/2)/(1/18)= 
<gadget id="calculator">(1/2)/(1/18)</gadget>
<output>9</output>
9 days   So total days required to complete the work is  15+9= 
<gadget id="calculator"> 15+9</gadget>
<output>24</output>
24 days.   24 daysNSWER:24 days
<result>A</result>
George takes 30 days to do a piece of work and Mark takes 45 days for the same work. For the first 15 days only George works. Then Mark also joins him. Find the time taken to complete the entire work.