A puzzle from Stuart Collingwood’s Lewis Carroll Picture Book, 1899:
A captive Queen and her son and daughter were shut up in the top room of a very high tower. Outside their window was a pulley with a rope round it, and a basket fastened at each end of the rope of equal weight. They managed to escape with the help of this and a weight they found in the room, quite safely. It would have been dangerous for any of them to come down if they weighed more than 15 lbs. more than the contents of the lower basket, for they would do so too quick, and they also managed not to weigh less either.
The one basket coming down would naturally of course draw the other up.
The Queen weighed 195 lbs., daughter 105, son 90, and the weight 75.
How did they do it?