1, father is 45 years old and son is 23 years old. A few years ago, my father was twice as old as my son.

2. Miss Li is 8 years older than her. 10 years ago, Miss Li's age was the same as that of 8 years later. How old are Miss Li and Wang Gang?

Three years later, the sum of the two sisters' ages is 27 years old, and the younger sister's age is exactly half that of the older sister. How old are the sisters?

The elephant asked his mother, "Mom, how old were you when I grew up to your present age?" Mom replied, "I'm 28 years old." The elephant asked again, "How old was I when you were my age?" Mom replied, "You are only 1 year old." How old is mother elephant?

The giant panda is three times as old as the little panda. In four years, the sum of the ages of the giant panda and the red panda will be 28 years old. How old are pandas and pandas?

6. Before15, the father's age was seven times that of his son, and after 10, the father's age was twice that of his son. Ask father and son how old they are.

7. Wang Tao's grandfather is two years older than his grandmother, his father is two years older than his mother, and a family of five is 200 years old. It is known that grandpa was five times as old as Wang Tao and his father was four times as old as Wang Tao four years ago. How old is Wang Tao's family?

Fourth grade Olympic math problem: analysis of cattle grazing

Historical origin: British mathematician Newton (1642- 1727) said: "When studying science, topics are more useful than rules." Therefore, in his works, many examples are always put together when explaining the theory. In Newton's book Arithmetic of Everything, there is a topic about finding the number of cattle, which is called Newton's problem of cattle eating grass.