I am an odd number

I am an odd number. Take away a letter and I become even. What number am I?




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Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

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In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.