[ Rebus $]$

Decode the rebus: KIS + KSI = ISK. Identical letters correspond to identical digits, different ones to different digits.

#
From the first digit of all three numbers, it follows that $K<$. Why?

## Solution

For convenience, let's rewrite this puzzle in a different way.

$$
\begin{array}{r}
+\begin{array}{l}
\mathrm{KHC} \\
\mathrm{KCH}
\end{array} \\
\hline \text { ICK}
\end{array}
$$

From the first column, it is clear that $K<I$. From this and the last column, it follows that $C+I=K+10$ (not $C+I=K$). Then from the second column, we derive $1+I+C=C$, or $1+I+C=10+C$. The first option is impossible, and from the second, we immediately determine that $I=9$. From this, $K=4$, and $C=5$. The entire puzzle is solved as follows: $495+459=954$.

## Answer

$495+459=954$.

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