Here 9 strikes in 3 innings are given. We have to find the unit rate of this situation.
So, in 3 innings there are the number of strikes = 9
To find the number of strikes in 1 inning we have to divide 9 by 3, as the number of innings is decreasing.
In 1 inning there are the number of strikes =
= 3
So we have got the required answer. The unit rate of the situation is 3 strikes in 1 inning.