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2.5

Step-by-step explanation:

beings that she made 20 bows at a constant rate, then all bows will be of the same length, so we can divide the 50 ft. of ribbon into 20 pieces as shown

50 / 20 = 2.5

you can do this with other problems of this type, and if you want to double check your work? multiply back to the beginning

2.5 * 20 = 50

hope this answers what you needed it to :)