Answer:
If Cindy bought 7/8 yard of ribbon, then Jacob bought (4/5) * (7/8) = 7/10 yard of ribbon.
Cindy bought 7/8 yard of ribbon. Jacob bought 4/5 the length of Cindy's ribbon. Therefore, Jacob bought 4/5 * 7/8 = 28/40 = 7/10 yard of ribbon.
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