72
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1x72, 72x1, 2x36, 36x2, 3x24, 24x3, 4x18, 18x4, 6x12, 12x6, 8x9, 9x8
1+2+3+4+5+6+7+(8x9)=100
If AC equals 6 and BD equals 4, then AB equals 5.
When equals are added to equals, you don't necessarily get wholes. But whatever you do get, they're equal.
9