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124+125+126=375
-19 plus 144 equals 125.
1 x 375, 3 x 125, 5 x 75, 15 x 25.
x equals 25
The best estimate is, of course, the correct value, which is so easy to calculate that I am astounded that anyone would want to estimate it. 128 + 375 = 125 + 3 + 375 = 125 + 375 + 3 = 500 + 3 = 503 The second best is 500.