You're missing a crucial part of the question! To know the amount of sugar in a mixture of sugar and water, we need to know:

* The total amount of the mixture: How much sugar and water are there in total (e.g., 1 cup, 10 grams, etc.)?

* The concentration of sugar: This could be expressed as:

* Percentage: What percentage of the mixture is sugar (e.g., 10% sugar)?

* Ratio: What ratio of sugar to water is present (e.g., 1:4 sugar to water)?

* Weight/volume: How much sugar is dissolved in a specific volume of water (e.g., 5 grams of sugar in 100 ml of water)?

Example:

Let's say you have a 100 ml mixture of sugar and water that is 20% sugar.

* Calculate sugar amount: 100 ml * 20% = 20 ml of sugar.

Please provide more information about the mixture so I can calculate the sugar content!