Step-by-step explanation:
We use unitary method to solve this question.
The unitary method is a method to solve a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
Given that Freund requires [tex]\frac{1}{2}[/tex] cups of spinach for [tex]3[/tex] cups of strawberry.
So,Freund requires [tex]\frac{\frac{1}{2} }{3} =\frac{1}{6}[/tex] cups of spinach for [tex]1[/tex] cup of strawberry.
So,for [tex]b[/tex] cups of strawberries,[tex]b\times \frac{1}{6}[/tex]=[tex]\frac{b}{6}[/tex] of spinach are needed.