exam Maths Puzzle Numerical Ability

the problem is on my practice test it is (61/2)divided by (6-4 1/4)

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What is the formula / equation to calculate the following problem (I have the solution, I need to understand how to do it using an algebraic formula):

Three-fifths of the men in
The demand equation for a certain product is p=x(30-0.0005x) where p is the price per unit and x is the number of units sold. The total revenue for selling x units is given by
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