Question
17 years ago, Lui was 7r years old.
  1. How old was Lui 4r years ago?
  2. How old will Lui be 2r years later?
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

17 years ago, Lui was 7r years old.
  1. How old was Lui 4r years ago?
  2. How old will Lui be 2r years later?