What is the next number in the sequence 1 11 21...

Question: What is the next number in the sequence? 1 11 21 1211 111221 312211

Question: Hard, Harder, and Hardest are brothers. By age from youngest to oldest, it goes Hard, Harder, Hardest. Hard is half the age of Hardest who is 20 which means hard is 10. Harder has a two-year difference between the number of years older he is than Hard and the number of years younger he is than Hardest. Harder is closer to the age of Hard than Hardest. How old is Harder?

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Question: What loses its head in the morning and gets it back at night?