Why is the solubility of a substance in water is 40 what is the maximum amount of solute is required to prepare a standard solution in the 50 gram of water?

If the solubility of a substance in water is 40 grams per 100 grams of water, this means that in 50 grams of water, you can dissolve half of that amount. Therefore, the maximum amount of solute you can dissolve in 50 grams of water is 20 grams.