Make drawings to represent the quantitative structure described in each of the following story problems: a. Andria poured herself 12 ounces of coffee. She drank 7.5 ounces. How much coffee does she have now? b. Byron is training for a marathon. Today, he needs to run 12 miles. He has run 7.5 miles so far. How much farther does he need to run to meet his training goal? c. Carolyn is 12 years old. David is 7.5 years old. How