Current location - Training Enrollment Network - Mathematics courses - Solve a math problem for primary school students. Xiaoming is 9 years old now and grandma is 55 years old. How many years later, grandma is three times as old as Xiaoming (please list the formula).
Solve a math problem for primary school students. Xiaoming is 9 years old now and grandma is 55 years old. How many years later, grandma is three times as old as Xiaoming (please list the formula).
How old are you in primary school?
If you pass the fourth grade, you already know the unknown.
Then it can be assumed that after x years, grandma is three times as old as Xiaoming.