Udon

Your sentence makes sense, but it might be more understandable with some specifics. In English, the most natural way to ask that would be: "How many bowls of udon can be made from 15kg of flour?"

As for the answer, that depends on many variables, such as the recipe used, the size of each bowl, and the portion of noodles each bowl contains. Generally, about 300 grams of flour might be used to make a large serving of udon noodles. If we were to use that measurement as an example, then 15kg of flour, or 15,000 grams, could potentially make around 50 bowls of udon. Of course, this is a rough estimation and could vary based on the factors mentioned above.