500
There are 45 fish in the large aquarium. 10 of the fish are green, 17 of the fish are blue, and the rest of the fish are orange. How many orange fish are in the aquarium?
(#2 on your worksheet)
There are 18 orange fish in the aquarium.
45 total fish. 10 green fish + 17 blue fish = 27 fish that are green or blue. The rest of the fish are orange. Take 27 away from 45 and that is how many fish are orange in the aquarium.