Please help

Question

The answer choices are A)9 B)11 C)13 D)15 QUESTION: Four workers work on a building and it takes them 8 days. If they had 3 workers how many days would it require

Answer 1

Bre, try this thought process. If it takes 4 workers a total of 8 days, that's a total of 32 'worker-days'.  32 is the total number of worker-days worked to construct the building.  But if we only have 3 workers, it will take longer than 4, right?  So, we know that the building will take 32 worker-days no matter how many workers we have (i.e., 32  workers could finish in only 1 day, and only 1 worker would take 32 days to finish).   So if we have only 3, then its 10 2/3 days total.  Or, we would round that up to 11 days.  (32 worker-days divided by 3 workers = 10 2/3 days). Answer is B.