Ajar holds 128 fluid ounces of juice. the label says the jar has 16 servings. how many fluid ounces are needed for 80 servings?

640 fluid ounces

Step-by-step explanation:

We assume that the fluid ounces in jar is directly proportional to the number of servings.

Given : A jar holds 128 fluid ounces of juice. The label says the jar has 16 servings.

Ratio of  fluid ounces of juice to number of servings =  (1)

Let x denotes the fluid ounces are needed for 80 servings.

Ratio of  fluid ounces of juice to number of servings =   (2)

From (1) and (2) , we have

  [in direct variation ration  remains constant.]

Hence, 640 fluid ounces are needed for 80 servings.