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85 since the most appropriate rounding for 90 is by the tens.

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True, but only if you are rounding to the nearest 10s - and there is no justification for assuming that. It could equally be to the nearest integer.

Or, you could be rounding to the nearest 30 (eg approx days in months), in which case you would go for 75. Less than 75 is 2 months = 60 days, more than is 3 months = 90 days.

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Q: What is the least number that can be rounded to 90?
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