20.
They told me that my answer was too short so I'm just adding this on, don't mind me.
Since simple sugars follow the Cn(H2O)n formula, if you had 11 oxygen
atoms, this would produce the simple sugar formula of C11H22O11.
Therefore, there should be 22 hydrogen atoms.
The direct source of energy to move the sailboat is probably wind, since wind is what pushes the sail of the sailboat, which is what propels the sailboat forward.
Hope this helps!
