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Fifty Two.
You combine letters to form words associated with the clues.
If you mean the sentence " The Fifty States " then it is 14 words. If you mean all the states in the U.S. it is some number I don't know.
Those letters spell Valentine's Day.
The phrase "post office" is a clever answer to the riddle, as it consists of two words and is associated with the handling of thousands of letters (mail). The play on words highlights the difference between literal and figurative interpretations of "thousand letters."
English letters do not have Chinese words associated with them (not even in Ancient Chinese).
Fifty-one million in words is spelled out as "fifty-one million." The number 51,000,000 is read as "fifty-one million" in English.
50.000 = fifty 50,000 = fifty thousand
In words, 0.56 is fifty-six hundredths.
Fifty point two.
Fifty-seven thousand, fifty.
The number 50 is written as fifty.