Those sorts of riddles often rely on misdirection -- they throw you information (in this case the weight of the ship) that is not relevant in any way. The ability to quickly determine what information is important and what isn't is particularly useful in trading. JB
Not to be picky, but, the important part is that the water is already displaced. If the lock had started at "empty" the displacement of a vessel is critical. But as we know, a ship needs water to float into the lock to begin with.
>If the lock had started at "empty" the displacement >of a vessel is critical. I disagree...and to prove my point (that I will make later) I will ask you to solve the same problem assuming that both vessels are dropped in via crane to sit on the bottom of a drained and dry lock. JB
Stu, in the case of my return riddle, both boats start out dry. I think it was acknowledged that in the original problem the boats floated in in a normal manner and both you and I were correct in our "the same amount" answer. JB