In the early months of some year, one site added 0.5 million new accounts every day. at this rate, how many days would be needed to add 30 million new accounts?

The answer that you are looking for is 60 . It will take 60 days until there will be 30 million new accounts added to a site. If you divide 30 from .5 you would get 60 so that would be your answer

It would take them about 4-5 years to get 30 million new accounts. I hope this helped ^^