book Maths Puzzle Numerical Ability

iF x varies inversely as y^2 and x=3 when y=24, find x when y=6

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book Other Question

I dont understand how to solve a problem that states : Find the area of a rectangle with L=2x+3 and W = x-2 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?