1800
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13.3
The estimated sum is 11 The actual sum is 10 and 19/24
The estimated sum is 11. The actual sum is 10 and 19/24
140 + 420 = 560
Well... 2.84 rounds to 3, and 3.21 rounds to 3. So 3 plus 3 is 6. The estimated sum is 6. The actual answer is 6.05 so that is right.