10. (Don't ask why.)
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10 The sequence is given by xn = 60/n
There really is no way of telling, but my guess is 22.
Those are the factors of the number 60, in descending order. The next factor is 10.
The sequence of differences between consecutive numbers is 9, 1, -20, 9, 1. If this continues then the next difference is -20 and therefore the seventh number is -5. (15 - 20).
20