Sandy can do a job in 12 days and Molly can do the same job in 24 days. If they work together, in how many days will they complete the job?	Select the correct option.
A) 6 B) 7 C) 8 D) 9 E) 10
Sandy can do 1/12 of the job each day.   Molly can do 1/24 of the job each day.   The combined rate is 1/12 + 1/24 = 1/8 of the job each day.   The job will take 8 days.   The answer is 8.
<result>C</result>
Sandy can do a job in 12 days and Molly can do the same job in 24 days. If they work together, in how many days will they complete the job?