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Anonymous
A reasonable estimate might be 6000 x 90 = 540000
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x + 89
Best estimate is 20 x 40 = 800 Actual answer is 22 x 39 = 858
1 x 89, 89 x 1
89 + x = x +89
Best estimate is 30 x 6 = 180 Actual answer is 192.34