Ram, who is half as efficient as Krish, will take 27 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task? Choose one:
A) 16 days
B) 12 days
C) 9 days
D) 6 days
E) 18 days
Number of days taken by Ram to complete task = 27   Since Ram is half as efficient as Krish , Amount of work done by Krish in 1 day = Amount of work done by Ram in 2 days   If total work done by Ram in 27 days is 27w   Amount of work done by Ram in 1 day = w   Amount of work done by Krish in 1 day = 2w   Total amount of work done by Krish and Ram in a day = 3w   Total amount of time needed by Krish and Ram to complete task = 27w/3w = 9 days   Answer 9 days27 /3= 
<gadget id="calculator">27 /3</gadget>
<output>9</output>
9 days   Answer 9 days
<result>C</result>
Ram, who is half as efficient as Krish, will take 27 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task?