Sydney needs to order some new supplies for the restaurant where she works. The restaurant needs at least 525 spoons. There are currently 335 spoons. If each set on sale contains 20 spoons, which inequality can be used to determine ss, the minimum number of sets of spoons Sydney should buy?
Let ss be the minimum number of sets of spoons Sydney should buy.
The total number of spoons needed is 525 - 335 = <<525-335=190>>190.
Each set contains 20 spoons, so Sydney should buy at least ss sets.
Therefore, the inequality is ss >= 190/20.
Rewriting the inequality in a simplified form, we get ss >= <<190/20=9.5>>9.5. Answer: \boxed{ss \geq 9.5}.