Answer:
320 grams
Explanation:
8 bats can eat 40 grams of insects per night, and we are trying to figure out how many insects 64 bats can eat. 64 bats is 8 times as many bats as 8 bats, and we find this by dividing 64 by 8. This means they will also eat 8 times as much, so we simply have to multiply 40 by 8 to get 320 grams.