While the above answer is, of course, correct, I'd like to explain how to get the answer in hopes that an explanation might help you do other problems like this on your own.
What you're being asked here is essentially this equation:
10/1=20/x
The most usual way to find for x when you have an equation like this is to cross-multiply. That is, you multiply the top of one fraction by the bottom of the other.
That gets you 10X=20
You then divide both sides by 10 and you get x=20
You can use this technique whenever you need to solve for x in a fraction like this.
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