Feed for horses

In the kennel have feed for two horses for 21 days. The station brought an additional 5 horses. How many days will last the feed for all the horses if they have the same daily ration?

Correct result:

t =  6 d


t=(221)/(2+5)=6 dt = (2\cdot 21)/(2+5) = 6 \ \text{d}

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