Rafiq is making a fruit punch using 48ounces of grape juice and some seltzer water. He wants to make 10 equal servings that are at least 9 ounces each. Should he add 32 or 48 ounces of seltzer water? Explain

10 servings of 9 oz each requires 90 oz of punch, which is 42 oz more than the grape juice Rafiq has.

Given the choices offered, Rafiq should add 48 ounces of seltzer water to meet his goal.