book Maths Puzzle Numerical Ability

what is the the 5th root of 32?

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For the life of me, I cannot figure out how to solve this equation. Any help would be greatly appreciated.

Solve for d: C = (2cd) / (a-d) or C = 2cd 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."