Standard 3 x 3 has a common total of 15, so multiplying each cell by 4 would create such a square:
16/36/08
12/20/28
32/04/24
If you want the cells to contain consecutive numbers then you have to use 16 - 24:
19/24/17
18/20/22
23/16/21
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20 times 3 equals 60
None. There is no perfect square that, when doubled, equals 60.
-60
Algebraically, you're asking to solve for x: 5x - 60 = x4x - 60 = 04x = 60x = 15Let's test just to be sure:15*5 = 7575 - 60 = 15It works, so 15 is the magic number.
240 inches