## 18. Seals

Once I entered a maritime museum and saw some seals there. There were not many of them - just seven eighths of all the seals plus another seven eighths of a seal that I counted in the pool. How many seals were there in the pool in total?

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18. Let $n$ be the total number of seals. In this case,

$$
n=(7 / 8) n+7 / 8
$$

from which it follows that $n=7$.

There were seven seals in the marine museum.