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If I feel unhappy, I do mathematics to become happy. If I am happy, I do mathematics to keep happy.
P. Turan, "The Work of Alfred Renyi", Matematikai Lapok 21, 1970, pp 199 - 210.
Loci: Convergence
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Brazen Lion
I am a brazen lion; my spouts are my two eyes, my mouth, and the flat of my right foot. My right eye fills a jar in 2 days, my left eye in 3, and my foot in 4. My mouth is capable of filling it in 6 hours. Tell me how long all 4 together will take to fill it. (Greece, AD 500)
Answer: 12/61 days; or 4 hours, 43 minutes, and almost 17 seconds
The answer is: 144/37 hours