1. 10 years ago, the father's age was six times that of his son. 10 years later, the father's age was twice that of his son, and they asked about their ages respectively: What is the situation of father and son this year? & ltbr/>； Solution, set more than ten years later, the son's age is X, and the father's age is twice. & ltbr/>； (2×20)= 6(X-20)& lt； br/>； 2X-20 = 6X- 120 & lt； br/>； 4X = 100 & lt； br/>； Said = 25