book Maths Puzzle Numerical Ability

Perform the indicated operations. Simplify the result.

(x-11/2x + 10) / (x^2 - 8x - 33/x + 5) * (x + 3/x^2)

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book Other Question

I need some help on this problem.

A virus scanning program is checking every file for viruses. It has completed checking 40% of the files in 300 seconds. How long should it take to check all the files?

Thanks,
Sher eight to the second power minus three to the second power times six divided by eighteen plus nine