1, it is necessary to find out the order and direction of the queue, taking the position of people (or things) as the standard.

2. When calculating the total number of people, if people (or things) are calculated twice,1will be subtracted; If there is no calculation, instead, add 1, which can neither be repeated nor omitted.

The key to solve this kind of problem is to skillfully use drawing, find out the repeated parts and then answer.

Related introduction:

The idea of solving complex application problems is composed of two or more interrelated simple application problems.

1, understanding the meaning of the question is to find out the known conditions and requirements in the application question.

2. Analyzing the quantitative relationship means analyzing the relationship between known quantity and unknown quantity, known quantity and unknown quantity, finding a solution to the problem, and determining what is first, then what is best.

3, column solution, that is, according to the analysis, list the formula and calculate.

4. Check the calculation, give the answer, that is, check whether the solution process is reasonable, whether the result is correct, whether it is consistent with the original question, and finally write the answer.