There were 15 crocodiles in the watering hole.
Since the ratio of the number of hippos to the number of crocodiles at a watering hole is 4:3, to show the number of crocodiles if there were 20 hippos, the following cross multiplication calculation must be performed:
- Hippos 4: 3 crocodiles
- Hippos 20: X crocodiles
- 4 = 20
- 3 = X
- 3 x 20/4 = X
- 60/4 = X
- 15 = X
Therefore, there were 15 crocodiles in the watering hole.
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