exam Maths Puzzle Numerical Ability

what I need to siplify is 5x(squared) + 15x over x(cubed) + 27.

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exam Other Question

A 8 horsepower pump fills a tank in 8 hours. A 3 horsepower pump fills it in 12 hours. Both pumps are turned on and begin to fill the tank. After 4 hours the 8 horsepower pump breaks. How long will it take the 3 horsepower pump to finish? I am just not good at word problems and my time is limited because of having two jobs. Could you please help me with this problem? Any country of your choice would be great. Tha