Hello!
If Barbara mixes 54 ounces of granola and 36 ounces of raisins, the overall mixture will equal 90 ounces. In order to find the amount of servings that Barbara makes, we must divide the total number by the other number given - 6.
Because Barbara wants to divide the mixture into 6 ounce servings, we will divide 90 by 6.
90/6=15
The answer to your question is "Barbara made 15 6-ounce servings."
I hope this helps you! Have a great day!