Answer:
Total size of ribbons needed by Alan = 61.75 feet
Explanations:
Size of ribbons required for a large present = 8.5 feet
Size of ribbons required for a medium present = 4.25 feet
Size of ribbons required for a small present = 2.25 feet
Alan is presenting 5 large presents, 4 medium presents, and 1 small present
Size of ribbons required for 5 large presents = 5 x 8.5 = 42.5 feet
Size of ribbons required for 4 medium presents = 4 x 4.25 = 17 feet
Size of ribbons required for 1 small present = 1 x 2.25 = 2.25 feet
Total size of ribbons needed by Alan = 42.5 + 17 + 2.25
Total size of ribbons needed by Alan = 61.75 feet