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Xu Peng is 30 years younger than his father this year. Four years later, my father was three times as old as Xu Peng. How old are Xu Peng and Dad?
Solution: Suppose Xu Peng is x years old, then his father is (x+30) years old.
3*(4+x)=x+30+4
12+3x=x+34
2x=22
x= 1 1
Dad's age: 1 1+30=4 1 (years old)
A: Xu Peng is 1 1 year old this year, and his father is 4 1 year old this year.