Answer:
90
Explanation:
To find how many 18-inch pieces of ribbon there are in 1620 inches, simply divide 1620 by 18.
1620/18 = 90
For the original question, we know that each roll of ribbon is 9 feet long. To convert to inches, multiply 9 by 12.
9*12 = 108
Now, to find how many 18-inch pieces of ribbon there are in 108 inches, divide 108 by 18.
108/18 = 6
Since we have 15 rolls of ribbon, multiply 6 by 15.
6*15 = 90
∴ The dressmaker can cut ninety 18-inch pieces from 15 rolls or ribbon.