Question 64580
The first square has 24 characters left over and the second square has 25 too few characters. The difference between the two squares must be 49 (25 + 24) characters.
The second square has x^2 grid positions. The first square has (x-1)^2=x^2-2x+1 grid positions.
The difference between these is 2x-1 grid positions which equals 49
2x-1=49
2x=50
x=25
so the second square has 25 rows and columns with 25 too few characters ie 625-25=600
The first square had 24 rows and columns with 24 too many characters ie 476+24=600