Look at the picture, find the rule, fill in the number at the question mark, why?
The first picture: 1 + 2 + 3 + 4 + 5 + 6 = 21
The second picture: 1 + 2 + 3 + 4 + 7 + 7 = 24
The third picture: the total number should be 27, fill in 11
The first picture: 1 + 2 + 3 + 4 + 5 + 6 = 21
The second picture: 1 + 2 + 3 + 4 + 7 + 7 = 24
The third picture: the total number should be 27, fill in 11