proportions word problems

Question

Jim needs to mix a medication with water to make the appropriate solution. The

medication says to mix 3 oz. of medication with 5 cups of water. Jim has 23 oz. of

medication. How much water will he need?

Answer 1

3 : 5 :: 23 : x proportion

3x = (5)(23) product means/extremes

3x = 115

x = 38 1/3

How much more water does Jim need?