Question

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

Answer 1

There are 16 servings for each 128 fluid ounces of juice.

Divide 80 servings by 16 servings, and 5 should be the quotient. Therefore, there are 5 jars of juice. Multiply 128 by 5 since 128 fluid ounces are in one jar. The answer should be 640 fluid ounces.

Answer 2

Answer: 640 fluid ounces

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 =
`(128)/(16)` (1)

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

Ratio of fluid ounces of juice to number of servings =
`(x)/(80)` (2)

From (1) and (2) , we have

`(x)/(80)=(128)/(16)` [in direct variation ration remains constant.]

`x=(128*80)/(16)=640`

Hence, 640 fluid ounces are needed for 80 servings.