500
What is wrong with this experiment?
Experimenting with the marshmallow guns, Jack and Jill decided that they wanted to compare the trajectories of their regular and modified marshmallow guns at different angles using different projectiles.
Jack shot the standard gun at 0 and 30 degrees using marshmallows, three times each.
Jill shot the modified gun in the other direction at 15 and 45 degree angles using Skittles. Unfortunately, she ran out of time, and only got 2 trials at each angle.
There are two variables being changed.
Both guns should be tested at the same angles for comparison
They are using different projectiles in each gun.
Etc.