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before and after

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  • what is the number between 15 and 17 ?
    16
  • what is the number before 19 ?
    18
  • what is the number before 16 ?
    15
  • what is the number between 5 and 7 ?
    6
  • what is the number after 5 ?
    6
  • what is the number between 11 and 13?
    12
  • what is the number after 19 ?
    20
  • what is the number after 11 ?
    12
  • what is the number before 8 ?
    7
  • what is the number before 13 ?
    12
  • what is the number between 18 and 20 ?
    19
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