book Maths Puzzle Numerical Ability

what is the equation and answer for 11/2,25/6,17/6,3/2,1/6

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book Other Question

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." Please Help me with the problem!!!

The speed of a pulley varies inversely with its diameter. One kind of pulley, with a diameter of 3 millimeters, turns at 150 revolutions per