book Maths Puzzle Numerical Ability

A principal earns interest of $196 in 3 years and 6 months at a simple interest rate of 6 1/2%.Find the principal invested?

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book Other Question

iF x varies inversely as y^2 and x=3 when y=24, find x when y=6 I have been working on this all day. could someone explain this problem to me i am working with adding and subtracting rational expressions with different denominators.

4x/2x^2 + x - 10 - 9x/x^2 + x - 6