Sheena needs 2⅔ cups of lemon juice to make 8 servings.ExplanationThe recipe says:Each serving = ⅓ cup lemon juice + ⅔ cup waterSheena wants to make 8 servings.So we multiply the amount of lemon juice per serving by 8:[tex] \sf \dfrac{1}{3} \times 8 = \dfrac{8}{3} \: \boxed{ \sf = 2 \dfrac{2}{3} }[/tex]