The answer is 248!grains I think this one I think is easy
<h3>
Answer: C. x+y = 4</h3>
This is the line through points A and C, which is one of the diagonals. Reflecting any square over its diagonal will result in the same figure. We can say it's symmetrical about the diagonal line.
Put another way, reflecting point B over the line x+y = 4 will have it land on point D. Then point D will move to where B used to reside. In short, points B and D swap places. Points A and C will stay fixed in place.
It goes down in fours, so you need to do it until you get to the 23rd number
7b - 2b + 3 - 1 = 0
(7b - 2b) = 5b
3 - 1 = 2
Thus:
5b + 2 = 0
5b = -2
b = -2/5 = -0.4
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