10 I think, 60 was reduced by 1/2, 30 by 1/3, 20 by 1/4, 15 by 1/5, so I'm guessing 12 by 1/6,
12 - 12/6 = 10
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Those are the factors of the number 60, in descending order. The next factor is 10.
10 ten
10 The sequence is given by xn = 60/n
There really is no way of telling, but my guess is 22.
The mode of 18, 20, 15, 12, and 20 is 20. The mode is 20 because that number is the most common in the set.