50
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100.
To round 51.65 to the nearest whole number, you look at the digit in the tenths place, which is 6. Since 6 is 5 or greater, you round up the whole number part from 51 to 52. Therefore, 51.65 rounded to the nearest whole number is 52.
The answer is 10
It is 10.
cf. "How do you round 85 to the nearest 10?" in this website.