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Anonymous
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Tables of 8 or 4 or 2 72 = 8x9 or 4x18 or 2x36 80 = 8x10 or 4x20 or 2x40
It is: 4/5 of 80 = 64
40 80 120 160 200 240 280 320 360 400
4 x 20 = 80
One fourth of 80 is 20.