Today Puzzle #728
Puzzle No. 728 鈥� Wednesday 29 April 2020
Farmer Green owns a pasture with sufficient grass on it to feed a cow, a horse and a sheep together for 10 days. Alternatively the pasture could feed a cow and a horse together for 20 days. How long could it sustain the sheep alone?
Today’s #PuzzleForToday has been set by Dr Steve Humble, Newcastle University
Click here for the answer
Details of a possible solution.
The pasture could sustain the sheep for 20 days
(1/C) + (1/H) + (1/S) = (1/10)
(1/C) + (1/H) = (1/20)
Subtracting these two equations gives (1/S) = (1/10) – (1/20) = (1/20)
Hence the pasture could sustain the sheep for 20 days
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