53.
Can you divide nine into two parts which are together equal to ten?
54. FOLDING A FLOCK
A shepherd had a flock of sheep in a fold enclosed by 100 hurdles. His master made a large purchase at the annual fair, and required him to pen some pigs with 16 of the hurdles, and to arrange the remainder so that they could accommodate nine times as many sheep as the 100 hurdles had contained. How was this possible?
55. A NEAT TRICK
Here is a neat final trick, if you have some reputation for sleight of hand. Place three biscuits on the table in a row, and cover each of them with a borrowed hat. Raise each hat in turn, gravely eat the biscuit, and replace the hat. Then undertake that the three biscuits shall be under whichever hat is selected. How can you contrive this?