A designer is decorating a square frame with ribbon. The designer has 50 3/8 inches of ribbon. The square frame is 8 1/4 inches long on each side.

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}