Answer:
20 1/4 yd
Explanation:
2 aprons = 4 1/2 yd
⇒ 1 apron = 4 1/2 ÷ 2 = 2 1/4 yd
⇒ 9 aprons = 2 1/4 x 9 = 20 1/4 yd
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