To solve this problem you must follow the proccedure shown below:
 1. You have the following information given in the problem above:
 - Marta is making 3 servings of fruit salad.
 - Marta adds 3/8 cups blueberries for each serving.
 - Her measuring cup holds 1/8 cup.
 2. Then, you have:
 1 time----1/8 cupÂ
     x----3/8 cups
 x=(3/8)/(1/8)
 x= 3x8/1x8
 x=24/8
 x=3 times
 How many times must Marta measure 1/8 cup of blueberry to have enough for the fruit salad?
 The answer is: 3 times