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


t=8 m=t 15=8 15=120  t2=t+t/2=8+8/2=12  d=m/t2=120/12=10

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