The mountain hut

The mountain hut has a supply of food for 8 tourists for 15 days. Half more were come. How long will their food supply last if the daily ration remains the same?

Correct result:

d =  10

Solution:

$$\begin{gathered} t=8 \\ m=t\cdot 15=8\cdot 15=120 \\ {t}_2=t+t\mathrm{/}2=8+8\mathrm{/}2=12 \\ d=m\mathrm{/}{t}_2=120\mathrm{/}12=10 \end{gathered}$$

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