Hanna is recovering hundreds of treasure chests from an ancient shipwreck. She is able to recover & chests every 4 hours.
Complete the table using equivalent ratios.
Treasure chests Hours
8 4
answer here 6
10 answer here

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}}