Answer:
50 bats total
Explanation:
To solve this problem, all one has to do is, set up a proportion, remember, a proportion is;

In this case;

It is given that;
percent - 60%
hits - 30
Now substitute in the values and solve;

Solve, first simplify;

Now use cross products;
150 = 3(total_bats)
Inverse operations;
150 = 3(total_bats)
/3 /3
50 = total_bats