Marcus and Chloe are building a sand castle using the ideal mixture of sand and water. They have partly filled a container with the ideal mixture. Marcus adds 3 cups of sand to the container. How much water should Chloe add to keep the ideal ratio of water to sand? ExplainChloe should add cup(s) of water since using the equation and substituting ___ for (w or s) gives (w or s) = ___