Problem analysis: According to the age difference, it will not change with time, so the age difference between mother and child this year is the age difference between mother and child after B years.

Carbon -24

=C-C+24

=24 years old

A: The age difference between mother and child is 24 years old.

The key is to know that the age difference will not change with time. Note that when the brackets are removed, the minus sign comes before the brackets, and the operation symbols in the brackets should be changed.

Extended data:

Skills of solving age problems in mathematical operation problems

1, the content of the topic examination is nothing more than the age comparison of several objects of different ages, assuming that one object is the age of another object, how old the other object is, and so on. Grasping the characteristic that the age difference of several objects of different ages will not change, the age question is answered quickly by equation method.

2. The characteristic of age difference is the key point to solve the age problem, but it is also unexpected. That is, when several objects of different ages were not born n years ago, the age difference of several objects of current age was different from that of n years ago, but at the other extreme, when several objects of different ages died n years later, the age difference remained unchanged.

3. Besides the constant age difference, we need to pay attention to birth and death, the application skills of equation method, and the enumeration of age objects in stem information by table or list. The combination of numbers and shapes can express the relationship more vividly, and the age value in the stem information can be analyzed through the answers.