A package with 60 donated clothing items was just dropped off. 1/5 of the items in the package were shirts
0.45 of the items were jeans.
The rest of the items in the package were dresses.
How many dresses were in the package
There were 60 x 1/5 = <<60*1/5=12>>12 shirts in the package.
There were 60 x 0.45 = <<60*0.45=27>>27 jeans in the package.
So, a total of 12 + 27 = <<12+27=39>>39 shirts and jeans were in the package.
Therefore, there were 60 - 39 = <<60-39=21>>21 dresses in the package. Answer: \boxed{21}.
To determine the number of dresses in the package, we first need to find the number of shirts and jeans since they were given as fractions.
Given that 1/5 of the items in the package were shirts, we can calculate this by multiplying the total number of items by 1/5:
Shirts = (1/5) * 60 = 12 shirts.
Given that 0.45 of the items were jeans, we can calculate this by multiplying the total number of items by 0.45:
Jeans = 0.45 * 60 = 27 jeans.
Now, to find the number of dresses in the package, we subtract the number of shirts and jeans from the total number of items:
Dresses = Total number of items - (Shirts + Jeans)
Dresses = 60 - (12 + 27)
Dresses = 60 - 39
Dresses = 21 dresses.
Therefore, there were 21 dresses in the package.