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Bradly Buckridge ∙
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The smaller number (-21, in this case) is the colder temperature.
Wiki User
Twenty below (-20) is colder than ten below (-10).
Since the numbers 20 and 21 share no common positive integer factors, 20/21 is expressed in its simplest form.
20.37 is the mean.
42/20 = 21/10 = 21/10