A vessel is filled with liquid, 3 parts of which are water and 5 parts syrup. How much of the mixture must be drawn off and replaced with water so that the mixture may be half water and half syrup?, Chemistry homework

A vessel is filled with liquid, 3 parts of which are water and 5 partssyrup. How much of the mixture must be drawn off and replaced with waterso that the mixture may be half water and half syrup?