The explanation is as follows:

1, a three-day delay means that today is the first day, tomorrow is the second day, and the day after tomorrow is the third day.

2. Three days later: not counting today, tomorrow is the first day, the day after tomorrow is the second day, and the day after tomorrow is the third day.

Most of these problems involving word discrimination come from the application problems of mathematical problems, which not only examine the calculation ability of mathematics, but also examine the ability of word analysis.

Extended data:

This kind of problem belongs to the addition and subtraction of time.

If it exceeds the maximum number of days in the current month, it will be included in the next month.

If it exceeds the maximum number of weeks, that is, 7, it will be included in the new cycle.

Addition arithmetic

(1) Same number alignment

(2) Counting from the unit

(3) When it is added to dozens, it will be pushed to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.