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Anonymous
I presume you don't mean 21 minus 13; that is easy enough, and equals 8. If you mean the ratio 13/21, all you do is divide. The answer is 0.1690___.
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13:21
n + 13 = 21. n = 21 - 13
13/21
If p is 13 then 13-21 = -8
21 x 13 = 273