The problem is to float as many pennies on a tinfoil raft as possible.
My hypothesis is that if a boat has more surface area then it will be able to hold more pennies because it will spread out the surface area on the water.
Our boat held 121 pennies.
That the more surface area would spread it out over the water instead of putting it all in one place.
I think I would have made the walls a little higher and not give up when the boat takes on a little water.