being ten more than fifty
"The crowd numbered sixty, which is exactly ten people more than the fifty we expected to arrive."
The cardinal number occurring after fifty-nine and before sixty-one, represented in Roman numerals as LX and in Arabic numerals as 60.
"The bus arrived at exactly sixty minutes past noon."
Sixty comes from Old English, originally meaning "six times ten." It shares a common Germanic root with related words in Dutch, German, and Scandinavian languages.