Professor Rackbrane, during one of his rambles, chanced to come upon a man digging a deep hole.
"Good morning," he said. "How deep is that hole?"
"Guess," replied the labourer. "My height is exactly five feet ten inches."
"How much deeper are you going?" said the professor.
"I am going twice as deep," was the answer, "and then my head will be twice as far below ground as it is now above ground."
Rackbrane now asks if you could tell how deep that hole would be when finished.
Farmer Tompkins had five trusses of hay, which he told his man Hodge to weigh before delivering them to a customer. The stupid fellow weighed them two at a time in all possible ways, and informed his master that the weights in pounds were 110, 112, 113, 114, 115, 116, 117, 118, 120, and 121. Now, how was Farmer Tompkins to find out from these figures how much every one of the five trusses weighed singly? The reader may at first think that he ought to be told "which pair is which pair," or something of that sort, but it is quite unnecessary. Can you give the five correct weights?