It is: 20
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19 rounds to:0 to the nearest hundred20 to the nearest ten
19.0
To round to the nearest hundred and ten both being 200 it leaves 9 possibilities. 195,196,197,198,199,201,202,203, and 204. The only one with digits adding up to 19 is 199.
To the nearest ten it is 80
To the nearest tenth: 0.2 To the nearest ten: Zero