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On an island, there are knights who always tell the truth, and liars who always lie. What question would you need to ask the islander to find out if he has a crocodile at home?

Seven nines written out in a series: 9 9 9 9 9 9 9. Put some “+” or “-” between some of them, so that the resultant expression equals 1989.

Decipher the numerical puzzle system

MA x MA = MIR

AM x AM = RIM

$($different letters correspond to different numbers, and identical letters correspond to the same numbers$)$.

Restore the numbers. Restore the digits in the following example by dividing as is shown in the image

Replace the letters in the word TRANSPORTIROVKA by numbers $($different letters correspond to different numbers, but the same letters correspond to identical numbers$)$ so that the inequality T $>$ R $>$ A $>$ N $<$ S $<$ P $<$ O $<$ R $<$ T $>$ I $>$ R $>$ O $<$ V $<$ K $<$ A.

Decipher the puzzle: KIS + KSI = ISK. The same letters correspond to the same numbers, different letters correspond to different numbers.

Decipher the puzzle shown in the picture. Same letters correspond to same numbers, different letters to different numbers.

Having understood the principles by which the numbers are depicted in the tables $($shown in the figures below$)$, insert the missing number into the first table, and remove the extra number from the second table.

The director of a power plant, considering the list of phone numbers and the names of his employees, noticed a certain relationship between names and phone numbers. Here are some names and phone numbers from the list:

Achinskiy 9125

Butenko 7215

Dapin 5414

Galick 6711

Martyanof 9136

Romidze 7185

What is the phone number of an employee named Ognef?

In the equation 101 – 102 = 1, move one digit in such a way that that it becomes true.

Before you is a lock “with a secret” $($see the picture$)$.

If you put the arrows on the desired letters, you will get the keyword and the lock will open. What is this word?

Try to read the word in the first figure, using the key $($see the second figure$)$.

An entire set of dominoes, except for 0-0, was laid out as shown in the figure. Different letters correspond to different numbers, the same – the same. The sum of the points in each line is 24. Try to restore the numbers.

Can the following equality be true:

$K \times O \times T$ = $A \times B \times C \times D \times E \times F$

if you substitute the letters with the numbers from 1 to 9? Different letters correspond to different numbers.

What word is encrypted: 22212221265121? Each letter is replaced by its number in the English alphabet.

Using five nines, arithmetic operations and exponentiation, form the numbers from 1 to 13.

Using five eights, arithmetic operations and exponentiation, form the numbers from 1 to 20.

Using five sevens, arithmetic operations and exponentiation, form the numbers from 1 to 22.

Using five sixes, arithmetic operations and exponentiation, form the numbers from 1 to 14.