273.
Another way of stating this is if x/21=13, what is x?
You can find x by multiplying both sides on the equation by 21. You'll end up with x=273.
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0.0667
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___.
Oh, dude, you're hitting me with some math now? Alright, so when you divide 273 by 13, the quotient is 21 and the remainder is 0. Basically, you divide 273 by 13, get 21, and there's nothing left over. Math is cool, I guess.
Just divide 13 by 16 - for example, on a calculator. This will give you the equivalent decimal.
Divide by 3, 7 and 13. 1, 3, 7, 13, 21, 39, 91, 273