Illness

Peter is ill and must take medication three times a day for one tablet. For how many days is a pack of 30 tablets enough for him, when on the third day he takes one tablet only in the morning and evening?

Correct result:

n =  14

Solution:

$$\begin{gathered} z=30-3\cdot 2=24 \\ n=2+z\mathrm{/}2=2+24\mathrm{/}2=14 \end{gathered}$$

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