book Maths Puzzle Numerical Ability

I need to know how to define a variable and write an inequality to model this situation. Not sure I understand what they are wanting. "There are over 20 species of crocodiles."

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please help me with this question.
solve bu any method.
-2x+2y=6
3x-y=3 A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour.