to make fruit punch darleen mixes 7 cups of water to every 3 cups of punch powder what proportion can be used to determine how many cups of punch powder darleen will need for 28 cups of water?

Greetings from Brasil...

Refer to attached

Let's make the ratio between cups of water and powdered punch.

ratio: 7/3

Multiplying that ratio by a number X we get 28 in the numerator and Y in the denominator, so

(7/3) · (X/X) = 28/Y

7X = 28

X = 4

3 · 4 = Y

So, for 28 cups of water will require 112 cups of powdered punch

i believe the answer is c.