Answer:
Ratio of At- Bats : Hits = 3 : 1
Explanation:
Total number of at- bats to Juan = 30
Total number of hits of Juan = 10
Now, the ratio of at- bats to hits =

=

Hence, the Ratio of At- Bats : Hits = 3 : 1
Which implies for every 3 at - hits, Juan hits only 1 baseball.