exam Maths Puzzle Numerical Ability

I am lost with this statistic, can anyone help me with this.

In an effort to determine the most effective way to teach safety principles to a group of employees, four different

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Police chief wants to locate enough police stations so that each sector of the city has an average response time of 6 minutes. Find the minimum number of facilities needed and the 12x^2-5x-2 [times] 18x+12 [times] 1/27x^3-12x

the three equations need to be multiplied together. the last one is a fraction, 1 over 27x3-12x