Li Nainai dances square dance. There are 7 people in front of her, 12 people in the back, 8 people on the left and 5 people on the right. How many people are there?

From a practical point of view, there are seven people in front of Li Nainai and 12 in the back, that is * * * 7+ 12 = 19, plus Li Nainai's own line, that is 20 lines.

Then in the same way, 8+5+ 1= 14 lines.

Then use 20x 14=280. So a * * * is 280 people.

In the second case, if the number of people in the last column is not complete, it cannot be calculated specifically.