What does it mean if two expressions are equivalent?

Solve for x, y, and z. show all steps.

Which equation represents the model shown? a)1/3 divide 1/6 = 2 b)2/3 divide 1/6 = 2/18 c)1/3 divide 1/6 = 1/18 d)2/3 divide 1/6 =4

How much orange juice do you need to make 2 servings of lemony orange slush?