Answer: She needed 128 cm of ribbon.
Explanation:
Since we have given that
Length of yellow ribbon needed to be cut = 1 meter
Length of blue ribbon needed to be cut = 28 cm
We need to find the number of centimeters she needed to be cut.
First of all, we convert meter into centimeter.
As we know that
1 meter = 100 centimeter
So, Total number of centimeters of ribbon she needed is given by

Hence, She needed 128 cm of ribbon.