Chemistry question. plz help?

You want to clean the floor in your kitchen, so you add ½ cup of floor cleaner to 2 gallons of water. While you aren’t looking, your little sister drinks some of the liquid. In a panic, you call the poison control center. What information will they need to know? Will your sister be very ill? Why is it more useful to express a solution in terms of concentration than in terms of quantity of solute alone?