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15 make 9. For instance, twice 9 are 18, 8 and 1 are 9; three times 9 are 27, 7 and 2 are 9; and so on. If multiplied by two or more figures, such as 12 or 123, the result will be the same, but in some cases the product may give a plurality of nines.

16. How much is a-third and half a-third of 5?

17. Add five strokes to six, so as to make nine.

18. A, B, and C had a dinner which cost them £5. B paid 25s. more than C, and A 258. more than B. How much did each pay?

19. If you cut 20 yards of cloth into one yard pieces, and cut one yard every minute, how long will it take you?

20. A woman going to the well to bring 4 quarts of water, had only a 3-quart measure and a 5-quart measure. How did she measure exactly 4 quarts?

21. Put down four 3's in such a way as that they will count 34.