Question
18 years ago, Carl was 7d years old.
  1. How old was Carl 4d years ago?
  2. How old will Carl be 3d years later?
2 m
(a)

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(b)

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18 years ago, Carl was 7d years old.
  1. How old was Carl 4d years ago?
  2. How old will Carl be 3d years later?