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Solve a third-grade math problem: mom is four times older than Xiaohong, and mom is 27 years older than Xiaohong. Ask mom and Xiaohong how old they are!
Thinking: the mother is four times as old as Xiaohong, that is, the mother is three times as old as Xiaohong;

My mother is 27 years older than Xiaohong, which means my mother is 3 times and 27 times older than Duo Xiaohong.

The age of 1 time can be obtained, that is, the age of the daughter: 27÷3=9 years old.

Mother's age: 9×4=36 years old.

Comprehensive formula: 27÷(4- 1)=9 (years old) 9×4=36 (years old)

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