book Maths Puzzle Numerical Ability

5/(x+2) - 3X/(x^2-3X)=

5/(x+2)- 3X/(x(x-3))=

It is at this point where I have no earthly idea what to do next. What cancels out?

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book Other Question

It rains for 40 hours, x hours at 40 ml per hour and x hours at 20 mil per hour. How long did it rain at each rate if the total rain amount is 1,100 ml?

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The simple interest earned on a pricipal of three hundred dollars at an annual interest rate of x percent is less than or equal to seventy-two dollars

How can i write this as a