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Math book P 195 math comprehension questions 1: Xiaoming 13 years old, father 40. When was his father four times older than Xiaoming?
According to the meaning of the question, it should be before dad is 40 years old, which may be four times the age of Xiaoming.
So when my father was four times as old as Xiao Ming X a few years ago, 4 (13-x) = 40-x.
The solution is X=4.
So four years ago, when my father was 36, he was four times as old as Xiao Ming.