Count all the fingers of the two hands, then commence to count
backwards on one hand, saying, “10, 9, 8, 7, 6” (with emphasis on
the _6_), and hold up the other hand saying, “and 5 makes 11.” This
simple deception has often puzzled many.
228. A man travelled a certain journey at the rate of four miles an
hour, and returned at the rate of three miles an hour. He took 21
hours in going and returning. What was the total distance gone over?
229. From what height above the earth will a person see one-third of
its surface?
230. The difference between 17/21 and 11/14 of a certain sum is £10.
What is the sum?