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17 rounds to 20
49 rounds to 50
20 + 50 = 70
You can get a better "estimate" by realizing that 20 is 3 higher than 17, and 50 is 1 higher than 49. This means your estimate is 3+1=4 higher than the actual value.
49 rounds to 50
20 + 50 = 70
You can get a better "estimate" by realizing that 20 is 3 higher than 17, and 50 is 1 higher than 49. This means your estimate is 3+1=4 higher than the actual value.
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