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)