The task is to read a passage and convert numbers in their text forms into digit forms. The text numbers can be used to represent Quantity, Dates and Time, Addresses or Positions.

Truly estimated that he gave this information to Fritz about fifteen or twenty minutes after the shots,
Truly estimated that he gave this information to Fritz about 15 or 20 minutes after the shots,

accumulated over a twenty year period, some of which included more than one individual.
accumulated over a 20 year period, some of which included more than one individual.

A Secret Service agent who spoke to Euins approximately twenty to thirty minutes after the assassination

A Secret Service agent who spoke to Euins approximately 20 to 30 minutes after the assassination