1. There are 3 crows perched on the branch of a tree. How many feet are there on the branch?   2. A fish tank contains 21 fish of which 9 are stationary. How many fish in the tank are moving?   3. There are 3 moths with a total of 27 red spots on their wings. If each moth has the same number of spots, how many spots on each moth?   4. There are 6 lions and 3 tigers in a circus show. How many legs are there in all?   5. A zoo has 9 African elephants and 6 Indian elephants. How many elephants are there in the zoo?