Bible Dictionaries
Seventy
Vine's Expository Dictionary of NT Words
  occurs in Luke 10:1,17; in Acts 7:14 it precedes pente, "five," lit., "seventy-five," rendered "threescore and fifteen;" for the details see  FIFTEEN , Note (1); in Acts 23:23 it is translated "threescore and ten;" in  Acts 27:37 it precedes hex, "six," lit., "seventy-six," rendered "threescore and sixteen." 
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Bibliography Information
Vines, W. E., M. A. Entry for 'Seventy'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/​dictionaries/​eng/​ved/​s/seventy.html. 1940.