Good swimmer

Good swimmer swims 23 m distance with ten shots. With how many shots he swim to an island located 81 m if still swims at the same speed?

Correct result:

n =  36

Solution:

$$\begin{gathered} z=23\mathrm{/}10={\displaystyle \frac{23}{10}}=2.3\text{ m } \\ s=81\text{ m } \\ n=\lceil s\mathrm{/}z\rceil =\lceil 81\mathrm{/}2.3\rceil =36 \end{gathered}$$

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