Mallory wants to run 24 miles this month. If she can run 3/4 of a mile each day she runs how many days will it take her to run those 24 miles?
If 3/4 of a mile is run each day, then in 1 month at 30 days, Mallory will run 30*3/4 = <<30*3/4=22.5>>22.5 miles.
To reach her goal Mallory will have to run an additional 24-22.5 = <<24-22.5=1.5>>1.5 miles.
It will take an additional 1.5/(3/4) = <<1.5/(3/4)=2>>2 days. Answer: \boxed{2}.