21,910

Which answer corresponds with the figures on the paper, which has been
on the table the whole time. If you have in the company two friends upon
whom you can rely as confederates, previously arrange with them to write
the third and fifth lines, explaining to them that they must deduct the
line immediately preceding theirs from 9's and make their lines the
products. This adds greatly to the mystery of the trick.

AN ARITHMETICAL PUZZLE

Take 9 from 6; from 9 take 10, and from 40 take 50, and you will find 6
remains.

SOLUTION.

FROM SIX | FROM IX | FROM XL
TAKE IX | TAKE X | TAKE L
S | I | X

AN ARITHMETICAL MYSTERY

Thirteen commercial travellers arrived at an inn, and each desired a
separate room. The landlady had but 12 vacant rooms, which may be
represented thus:--

----------------------------------------------------
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
----------------------------------------------------

But she promised to accommodate all according to their wishes. So she
showed two of the travellers into room No. 1, asking them to remain a
few minutes together. Traveller No. 3 she showed into room No. 2,
traveller No. 4 she showed into room No. 3, traveller No. 5 into room
No. 4, traveller No. 6 into room No. 5, and so on until she had put the
twelfth traveller into Room No. 11. She then went back to where she had
left the two travellers together, and asking the thirteenth traveller to
follow her, led him to No. 12, the remaining room. Thus all were
accommodated. Ask your friends to explain the mystery.

HOW TO TELL HER AGE

Girls of a marriageable age do not like to tell how old they are, but
you can find out by following the subjoined instructions, the young lady
doing the figuring: Tell her to put down the number of the month in
which she was born, then to multiply it by 2, then to add 5, then to
multiply it by 50, then to add her age, then to subtract 365, then to
add 115, then tell her to tell you the amount she has left. The two
figures to the right will tell you her age and the remainder the month
of her birth. For example, the amount is 822, she is twenty-two years
old and was born in the eighth month (August).

A RACE IN ADDITION

Tell a friend that you will race him in counting from 1 t