exam Maths Puzzle Numerical Ability

I need help in figuring out these kind of problem please. can I get a example of how to do this. problem 12/16 times 4/3 divided by 5/6.

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PLease help me add or subtract and simplify.(If the denominator has 3 or more factors other than monomials it needs to be left factored.)

a-8b over a+b + a+13b over a+b the sum of the measures of the interior angles of a polygon is between 2100 and 2400. how many sides does the polygon have? thanks..