Azul when snorkeling and he noticed that the ratio of parrot fish to clownfish was 4:3. He saw 20 parrot fish. How many clown fish did he see?

So Parrot Fish is the 4 and the clown fish was the 3.

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20 x

So what we need to do is find out what X is. 4 can go into 20 5 times ... So multiply 3 with 5 to get 15.

So Azul saw 15 clownfish.